JP6822097B2 - Light source device, lighting device and projector - Google Patents

Description

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

Conventionally, there is a laser array light source device in which a plurality of laser diodes provided on a support member are covered with a cover member having a lens array (see, for example, Patent Document 1 below). When joining the cover member to the support member in this laser array light source device, it is convenient to use an adhesive material (joining member).

U.S. Patent Application Publication No. 2003/0043582

By the way, a part of the laser light emitted to the outside from the cover member may be reflected by some member and returned to the laser array light source device. When the adhesive is irradiated with the return light, the adhesive may deteriorate, and the cover member may be misaligned or fall off.

The present invention has been made in view of such circumstances, and one of the objects of the present invention is to provide a light source device capable of reducing deterioration of a joining member due to return light. Another object of the present invention is to provide a lighting device provided with the above light source device. Another object of the present invention is to provide a projector provided with the lighting device or the light source device.

According to the first aspect of the present invention, a support member having a first surface, a cover member provided on the first surface side of the support member and having a light transmitting portion, the support member and the cover member. A light emitting element provided between the two, a joining member for joining the support member and the cover member, a light shielding member provided on the cover member side of the joining member, and light emitted from the light emitting element. The cover member is provided between the light-shielding member and the support member, and the light-shielding member is provided with a light-shielding member having a hollow portion through which the light-shielding member passes. A light source device having a sexual protrusion, which functions as the light- shielding member, is provided.

According to the light source device according to the first aspect, the light-shielding member blocks the return light that is reflected by some member and returns to the light source device side. As a result, the amount of return light emitted to the joining member is reduced, so that deterioration of the joining member due to the return light can be reduced.

In the first aspect, it is preferable that the light transmitting portion has a refractive power.
According to this configuration, the light emitted from the light emitting element is parallelized before it spreads significantly. Therefore, the light emitted from the light emitting element can be efficiently used in the subsequent optical system. Further, since parallel light is emitted, it is possible to reduce the generation of unnecessary return light.

In the first aspect, it is preferable that the light-shielding member is provided between the cover member and the joining member.
According to this configuration, since the light-shielding member and the joining member are arranged close to each other, the return light wrapping around the light-shielding member and irradiating the joining member is reduced. Therefore, deterioration of the joining member can be further reduced.

In the first aspect, it is preferable that the cover member is provided between the light-shielding member and the support member, and the cover member is urged in the direction of the support member by the light-shielding member. ..
According to this configuration, since the light-shielding member has a function of fixing the cover member, the cover member can be held against the support member even if the joining force of the joining member is reduced. Therefore, the cover member does not fall off or misalignment occurs.

In the first aspect, the light guide member further includes a hollow portion through which the light emitted from the light emitting element passes, and the light guide member includes a light-shielding protruding portion protruding into the hollow portion. The protruding portion preferably functions as the light-shielding member.
According to this configuration, since a part of the light guide member is used as a light shielding member, the number of parts can be reduced.

According to the second aspect, a lighting device including the light source device according to the first aspect and a wavelength conversion element into which the light emitted from the light source device is incident is provided.

According to the lighting device according to the second aspect, since the light source device is provided, the wavelength conversion element can be stably irradiated with light.

According to the third aspect, the lighting device according to the second aspect, the light modulation device that forms the image light by modulating the light from the lighting device according to the image information, and the image light are projected. A projector comprising a projection optical system is provided.

According to the projector according to the third aspect, since the lighting device is provided, an image having stable brightness can be projected.

According to the fourth aspect of the present invention, the light source device according to the first aspect, the light modulation device that forms image light by modulating the light from the light source device according to the image information, and the image light. A projector comprising a projection optical system for projecting is provided.

According to the projector according to the fourth aspect, since the light source device is provided, an image having stable brightness can be projected.

The figure which shows the schematic structure of the projector of 1st Embodiment. The perspective view which shows the schematic structure of the light source apparatus of 1st Embodiment. The cross-sectional view which shows the schematic structure of the light source apparatus of 1st Embodiment. The cross-sectional view which shows the schematic structure of the light source device which concerns on 1st modification. The cross-sectional view which shows the schematic structure of the light source apparatus which concerns on 2nd modification. The cross-sectional view which shows the schematic structure of the light source apparatus which concerns on 3rd modification. The cross-sectional view which shows the schematic structure of the light source apparatus which concerns on 4th modification. The schematic block diagram which shows the projector of 2nd Embodiment. The figure which shows the schematic structure of the illuminating device for blue light.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in the drawings used in the following description, in order to make the features easy to understand, the featured parts may be enlarged for convenience, and the dimensional ratio of each component may not be the same as the actual one. Absent.

(First Embodiment)
First, the projector according to this embodiment will be described. FIG. 1 is a diagram showing a schematic configuration of the projector 1 of the present embodiment.
As shown in FIG. 1, the projector 1 includes a lighting device 100, a color separation light guide optical system 200, optical modulators 400R, 400G, 400B, a cross dichroic prism 500, and a projection optical system 600.

In the present embodiment, the lighting device 100 emits white light WL including red light (R), green light (G), and blue light (B).

The color-separated light guide optical system 200 includes dichroic mirrors 210, 220, reflection mirrors 230, 240, 250, and relay lenses 260, 270. The color separation light guide optical system 200 separates the white light WL from the lighting device 100 into red light R, green light G, and blue light B, and the red light R, green light G, and blue light B correspond to each other. The light is guided to the modulators 400R, 400G, and 400B.
Field lenses 300R, 300G, 300B are arranged between the color separation light guide optical system 200 and the optical modulators 400R, 400G, 400B.

The dichroic mirror 210 is a dichroic mirror that allows a red light component to pass through and reflects a green light component and a blue light component.
The dichroic mirror 220 is a dichroic mirror that reflects a green light component and allows a blue light component to pass through.
The reflection mirror 230 is a reflection mirror that reflects a red light component.
The reflection mirrors 240 and 250 are reflection mirrors that reflect a blue light component.

The optical modulators 400R, 400G, and 400B include a liquid crystal panel that modulates incident colored light according to image information to form a color image. The operation mode of the liquid crystal panel is not particularly limited, such as a TN mode, a VA mode, and a lateral electric field mode.

The optical modulators 400R, 400G, and 400B each include an incident side polarizing plate (not shown) arranged on the light incident surface side and an emitting side polarizing plate (not shown) arranged on the light emitting surface side. ..

The cross dichroic prism 500 forms a color image by synthesizing the image lights emitted from the optical modulators 400R, 400G, and 400B.

The cross dichroic prism 500 has a substantially square shape in a plan view in which four right-angled prisms are bonded together, and a dielectric multilayer film is formed at a substantially X-shaped interface in which the right-angled prisms are bonded to each other.

The color image ejected from the cross dichroic prism 500 is magnified and projected by the projection optical system 600 to form an image on the screen SCR.

(Lighting device)
Next, the configuration of the lighting device 100 of the present embodiment will be described.
As shown in FIG. 1, the lighting device 100 includes a light source device 2, a condensing optical system 20, a rotating fluorescent plate (wavelength conversion element) 30, a motor 50, a collimating optical system 60, a first lens array 120, and a second lens. It includes an array 130, a polarization conversion element 140, and a superimposing lens 150. The light source device 2 emits a light bundle LB composed of blue laser light as excitation light to the rotating fluorescent plate 30.

(Light source device)
Here, the configuration of the light source device 2 will be described.
FIG. 2 is a perspective view showing a schematic configuration of the light source device 2 of the present embodiment, and FIG. 3 is a cross-sectional view showing a schematic configuration of the light source device 2 of the present embodiment.
As shown in FIGS. 2 and 3, the light source device 2 of the present embodiment includes a support member 10, a plurality of light emitting elements 12, a plurality of electrodes 14, a cover member 15, and a light shielding member 16. In the present embodiment, the support member 10 includes a support substrate 11 and a frame member 13.

Hereinafter, in the description using the drawings, the XYZ coordinate system will be used. The two directions orthogonal to each other in the plane direction of the support substrate 11 are the X and Y directions, and the directions orthogonal to the X and Y directions and parallel to the optical axis of the light emitted from the light source device 2 are the Z directions. ..

The support substrate 11 has a rectangular shape such as a substantially square or a substantially rectangular shape in a plan view. The first surface 11a on which the light emitting element 12 is mounted is, for example, a flat surface. A heat radiating structure such as a heat sink may be provided on the surface of the support substrate 11 opposite to the first surface 11a.

As a material for forming the support substrate 11, a material having high heat dissipation, for example, a metal material is used. As such a metal material, copper or aluminum is preferable, and copper is more preferably used. By using the support substrate 11 made of a metal material, the substrate has higher heat dissipation than the conventional substrate made of ceramics.

The light emitting element 12 is provided on the first surface 11a side of the support substrate 11 directly or via a mount member (not shown), for example, by using a solder material. In this embodiment, a total of 16 light emitting elements 12 are arranged, four each in the X direction and the Y direction of the support substrate 11. The light emitting element 12 emits light along the Z direction perpendicular to the first surface 11a. The number of light emitting elements 12 is not limited to the above, and can be changed as appropriate.

As the light emitting element 12, for example, a light emitting diode or a semiconductor laser is used. The light emitting element 12 can be selected with an arbitrary wavelength depending on the application. In this embodiment, a semiconductor laser that emits blue light having a wavelength of 430 nm to 490 nm is used as the light emitting element 12.

The frame material 13 is provided on the first surface 11a side of the support substrate 11 so as to surround the plurality of light emitting elements 12. The frame member 13 is joined to the first surface 11a of the support substrate 11 by, for example, silver wax.

As the material for forming the frame material 13, a material having a lower thermal conductivity than that of the support substrate 11 is used. As such a material, for example, Kovar is used. A plating layer is formed on the surface of the frame material 13, and for example, a plating layer made of nickel-gold is formed.

By making the thermal conductivity of the frame material 13 lower than the thermal conductivity of the support substrate 11 in this way, the heat generated when the cover member 15 is joined to the frame material 13 emits light through the support substrate 11. It becomes difficult to transmit to the element 12.

The frame material 13 is provided with a plurality of through holes 13a. Each through hole 13a is provided with an electrode 14 for supplying electric power to the light emitting element 12. In FIG. 3, the electrode 14 is not shown.

The through holes 13a and the electrodes 14 are sealed with low melting point glass or the like.

In the present embodiment, the cover member 15 is provided so as to face the first surface 11a of the support substrate 11. The cover member 15 has a rectangular shape along the frame member 13 and closes one opening side of the frame member 13. The cover member 15 is a plate-shaped member made of a light-transmitting material as a forming material. Examples of such a forming material include glass such as borosilicate glass, quartz glass, and synthetic quartz glass, crystal, and sapphire.

In the present embodiment, the cover member 15 is joined to the support member 10 by an adhesive 18 made of an organic material. In the present embodiment, the cover member 15 is joined to the frame member 13. Although it is possible to use a joining method other than using the adhesive material 18 for joining the cover member 15 and the frame material 13, joining with the adhesive material 18 is superior in consideration of cost and mass productivity. Generally, the adhesive fixing function of the adhesive material 18 made of an organic material deteriorates when exposed to light.

In the present embodiment, the cover member 15, the frame member 13, and the support substrate 11 form an accommodation space S for accommodating a plurality of light emitting elements 12. The accommodation space S is a closed space in order to reduce the adhesion of organic substances and water to the surface of the light emitting element 12. At this time, the accommodation space S may be in a reduced pressure state. When the accommodation space S is not in a reduced pressure state, it is preferably filled with an inert gas such as nitrogen gas or dry air. As this inert gas, it is preferable to use an industrial high-purity gas.

In the present embodiment, the cover member 15 has a refractive power. Specifically, in the present embodiment, the collimating lens unit 25 that parallelizes the light emitted from the light emitting element 12 is integrally formed with the cover member 15. The collimating lens unit 25 has a plurality of lenses 25a arranged corresponding to each light emitting element 12. That is, the collimating lens unit 25 has the same number of lenses 25a as the light emitting elements 12 (16 in this embodiment).

Based on such a configuration, the light source device 2 emits a light beam bundle LB composed of a plurality of parallelized blue laser lights.

The light-shielding member 16 is for blocking the return light RL of the light beam bundle LB emitted from the light source device 2 described later. The light-shielding member 16 is provided on the cover member 15 side of the adhesive material 18. In the present embodiment, the light-shielding member 16 is provided on the upper surface 15a (the surface on the + Z side) of the cover member 15. The light-shielding member 16 is composed of, for example, a reflective film such as a metal film or a dielectric film, or a light-shielding film. In this embodiment, a reflective film is used as the light-shielding member 16. When a reflective film is used as the light-shielding member 16, heat generation due to light absorption can be reduced as compared with the case where a light-shielding film is used.

Returning to FIG. 1, the condensing optical system 20 includes at least one first lens 22. The condensing optical system 20 is arranged in the optical path from the light source device 2 to the rotating fluorescent plate 30, and is incident on the phosphor layer 42 as excitation light in a state in which the light bundle LB is substantially condensed. The first lens 22 is made of a convex lens.

The rotating fluorescent plate 30 is formed by providing a phosphor layer 42 on a disk 38 that can be rotated by a motor 50 along the circumferential direction of the disk 38. The disk 38 is made of a material that transmits blue light. As the material of the disk 38, for example, quartz glass, crystal, sapphire, optical glass, transparent resin and the like can be used.

The light beam bundle LB emitted from the light source device 2 is incident on the phosphor layer 42 from the disk 38 side. The phosphor layer 42 is excited by the ray bundle LB. The phosphor layer 42 converts a part of the light beam bundle LB from the light source device 2 into fluorescent light YL, and allows the remaining part of the light beam bundle LB to pass through without conversion. The phosphor layer 42 is composed of, for example, a layer containing (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG-based phosphor.

A dichroic film 44 is provided between the phosphor layer 42 and the disk 38, which transmits the light bundle LB composed of blue laser light and reflects the fluorescent light YL. As a result, the rotating fluorescent plate 30 is directed toward the collimating optical system 60 by synthesizing a part of the blue light bundle LB transmitted through the phosphor layer 42 and the fluorescent light YL emitted from the phosphor layer 42. Emits white light WL.

The collimating optical system 60 includes a first lens 62 and a second lens 64, and substantially parallelizes the white light WL emitted from the rotating fluorescent plate 30. The first lens 62 and the second lens 64 are made of a convex lens.

The white light WL parallelized by the collimating optical system 60 is incident on the first lens array 120. The first lens array 120 has a plurality of first small lenses 122 for dividing the light from the collimating optical system 60 into a plurality of partial luminous fluxes. The plurality of first small lenses 122 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax of the illumination device 100.

The second lens array 130 has a plurality of second small lenses 132 corresponding to the plurality of first small lenses 122 of the first lens array 120. The second lens array 130, together with the superposed lens 150, forms an image of each first small lens 122 of the first lens array 120 in the vicinity of the image forming region of each of the optical modulators 400R, 400G, and 400B. The plurality of second small lenses 132 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

The polarization conversion element 140 converts each partial luminous flux divided by the first lens array 120 into linearly polarized light. The polarization conversion element 140 transmits one of the polarization components contained in the white light WL emitted from the illumination device 100 as it is, and reflects the other linear polarization component in a direction perpendicular to the illumination optical axis 100ax. The polarization separation layer, the reflection layer that reflects the other linearly polarized light component reflected by the polarization separation layer in the direction parallel to the illumination optical axis 100ax, and the other linearly polarized light component reflected by the reflection layer are linearly polarized on one side. It has a retardation plate that converts into components.

The superimposing lens 150 collects each partial luminous flux from the polarization conversion element 140 and superimposes it on the vicinity of the image forming region of each of the optical modulation devices 400R, 400G, 400B. The first lens array 120, the second lens array 130, and the superimposed lens 150 constitute an integrator optical system that makes the in-plane light intensity distribution of the white light WL from the illuminating device 100 uniform in the image forming region.

By the way, the lighting device 100 of the present embodiment includes a member (for example, a condensing optical system 20, a rotating fluorescent plate 30, etc.) in addition to the light source device 2 as a component. Therefore, a part of the light beam bundle LB emitted from the light source device 2 may be reflected by some member and returned to the light source device 2 to be irradiated as light.

When a part of the light beam bundle LB is incident on the light source device 2 as return light, the adhesive material 18 that joins the cover member 15 to the support member 10 may be exposed to the light beam bundle LB. When the adhesive material 18 made of an organic material is exposed to light, deterioration progresses, and the original adhesive fixing function cannot be maintained. In particular, in the present embodiment, since the light bundle LB is light having a short wavelength, deterioration of the adhesive material 18 is likely to be accelerated.

On the other hand, as shown in FIG. 3, the light source device 2 of the present embodiment reflects the return light RL by the light-shielding member 16 provided on the upper surface 15a of the cover member 15. As a result, the return light RL toward the adhesive 18 can be shielded from light. Therefore, the deterioration of the adhesive material 18 due to the return light RL can be reduced.

Further, since the light source device 2 includes the cover member 15 having a refractive power by integrally forming the collimating lens unit 25, a plurality of lights emitted from the light emitting element 12 are parallelized before they are greatly spread. .. Therefore, the light emitted from the light emitting element 12 is efficiently incident on the subsequent optical system (condensing optical system 20), so that the light utilization efficiency is high. Further, since parallel light (light bundle LB) is emitted, it is possible to reduce the generation of unnecessary return light RL.

Therefore, in the light source device 2 of the present embodiment, the position shift of the cover member 15 with respect to the support member 10 due to the deterioration of the adhesive material 18 is less likely to occur. Therefore, the positional deviation between the light emitting element 12 and the cover member 15 (colimating lens unit 25) is reduced, so that the traveling direction of the light beam bundle LB is unlikely to change. Therefore, the light bundle LB can be irradiated to a predetermined position.

Further, since the cover member 15 does not fall off from the support member 10, the sealed state of the accommodation space S accommodating the light emitting element 12 is kept good. Therefore, the adhesion of organic substances and water to the surface of the light emitting element 12 is reduced, and the light emitting element 12 is less likely to deteriorate.

As described above, according to the lighting device 100 of the present embodiment, since the light source device 2 is provided, the rotating fluorescent plate 30 can be stably irradiated with the light bundle LB to stably generate the white light WL. Therefore, according to the projector 1 of the present embodiment, since the lighting device 100 is provided, an image having stable brightness can be projected.

(First modification)
Subsequently, a first modification of the light source device will be described. The difference between the light source device of this modification and the light source device 2 of the first embodiment is the arrangement of the light-shielding member 16, and the other configurations are common. In the following, the same components and members as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a cross-sectional view showing a schematic configuration of the light source device 2A according to the first modification. As shown in FIG. 4, the light source device 2A includes a support member 10, a plurality of light emitting elements 12, a plurality of electrodes (not shown), a cover member 15, and a light shielding member 16A.

The light-shielding member 16A is provided between the cover member 15 and the adhesive material 18. In this modification, the light-shielding member 16A is provided on the lower surface 15b (the surface on the −Z side) of the cover member 15, and the light-shielding member 16A is in direct contact with the adhesive material 18. In the present embodiment, the light-shielding member 16A extends toward the inside of the accommodation space S from the adhesive material 18. As a result, the light-shielding member 16A is in a state of covering the upper part of the adhesive material 18 in an eaves shape.

According to the present embodiment, since the light-shielding member 16A is in contact with the adhesive material 18, the amount of return light RL that wraps around the light-shielding member 16A and is incident on the adhesive material 18 is small. Therefore, the deterioration of the adhesive material 18 can be further reduced as compared with the light source device 2 of the first embodiment.

(Second modification)
Subsequently, a second modification of the light source device will be described. The difference between the light source device of this modification and the light source device 2 of the first embodiment is the arrangement of the light shielding member 16. In the following, the same components and members as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a cross-sectional view showing a schematic configuration of the light source device 2B according to the second modification.
As shown in FIG. 5, the light source device 2B includes a support member 10, a plurality of light emitting elements 12, a plurality of electrodes (not shown), a cover member 15, and a light shielding member 16B.

The light-shielding member 16B is provided on the cover member 15 side of the adhesive material 18. In this modification, the cover member 15 is provided between the light-shielding member 16B and the support member 10. The cover member 15 is urged in the direction of the support member 10 by the light-shielding member 16B.

Specifically, the light-shielding member 16B includes a frame body 16B2 and an upper plate portion 16B1. The frame body 16B2 is a member that is arranged on the first surface 11a of the support substrate 11 and surrounds the cover member 15 in a frame shape. The upper plate portion 16B1 is connected to the upper end of the frame body 16B2 and extends inward from the frame body 16B2. The upper plate portion 16B1 is provided so as to overlap at least the adhesive material 18 when the cover member 15 is viewed from above.

Since the light-shielding member 16B is fixed to the support substrate 11 by the screw member 19, the upper plate portion 16B1 urges the cover member 15 toward the lower side (support member 10 side).

According to the configuration of this modification, since the light-shielding member 16B has a function of fixing the cover member 15, the position of the cover member 15 can be maintained even if the bonding force of the adhesive material 18 is reduced. Therefore, it is possible to prevent the cover member 15 from falling off or being misaligned.

In this configuration, the case where the screw member 19 for fixing the light-shielding member 16B is attached to the support substrate 11 has been given as an example, but the present invention is not limited to this. For example, the screw member 19 may be fixed to a heat radiating structure such as a heat sink provided on a surface of the support substrate 11 opposite to the first surface 11a.

(Third modification example)
Subsequently, a third modification of the light source device will be described. In the following, the same components and members as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a cross-sectional view showing a schematic configuration of the light source device 2C according to the third modification.
As shown in FIG. 6, the light source device 2C includes a support member 10, a plurality of light emitting elements 12, a plurality of electrodes (not shown), a cover member 15, a heat sink 65, and a light guide member 70. There is.

The heat sink 65 supports the support member 10. The heat generated by the light emitting element 12 is transferred to the heat sink 65 via the support substrate 10 and discharged from the heat sink 65. The heat sink 65 holds the light guide member 70. The light guide member 70 has a hollow portion 71 that allows light emitted from the light emitting element 12 to pass through. The hollow portion 71 is formed so as to extend upward from the upper surface 15a of the cover member 15, and the end portion on the opposite side to the upper surface 15a is open.
Based on such a configuration, the light guide member 70 is adapted to guide the light emitted from the light emitting element 12 upward along the hollow portion 71 and emit it to the outside.

The light guide member 70 has a protruding portion 72 protruding from the hollow portion 71. The protruding portion 72 has a light-shielding property, and by abutting the upper surface 15a of the cover member 15, the cover member 15 is urged toward the lower side (support member 10 side). The protrusion 72 overlaps with at least the adhesive 18 when the cover member 15 is viewed from above. In this modification, the protruding portion 72 functions as a light-shielding member that blocks the return light to the adhesive material 18.

According to the configuration of this modification, since the protruding portion 72, which is a part of the light guide member 70, is used as the light shielding member, the number of parts can be reduced.

(Fourth modification)
In the description of the third modification, the case where the protruding portion 72 is composed of one member is taken as an example, but the protruding portion 72 may be composed of a plurality of members. FIG. 7 is a cross-sectional view showing a schematic configuration of the light source device 2D according to the fourth modification. As shown in FIG. 7, in this modification, the protruding portion 72 is composed of a first member 72A and a second member 72B. The first member 72A is integrally molded with the light guide member 70. The second member 72B is fixed to the first member 72A by the screw member 73.

The second member 72B has a light-shielding property, and by contacting the upper surface 15a of the cover member 15, the cover member 15 is urged toward the lower side (support member 10 side). The second member 72B overlaps with at least the adhesive 18 when the cover member 15 is viewed from above. In the configuration shown in FIG. 7, the second member 72B functions as a light-shielding member that blocks the return light to the adhesive material 18.
In the case of this configuration, the position of the light guide member 70 can be determined according to the position of the adhesive 18 in a state where the second member 72B is not attached, so that the assembly is easy.

According to the configuration of this modification, since the protruding portion 72 has a function of fixing the cover member 15, the position of the cover member 15 can be maintained even if the bonding force of the adhesive material 18 is reduced. Therefore, the cover member 15 is unlikely to fall off or be misaligned.

(Second Embodiment)
Subsequently, the projector according to the second embodiment will be described. The structure around the projection optical system of the projector according to the second embodiment is substantially the same as that of the projector according to the first embodiment, but the configuration of the lighting device is different. Therefore, in the following description, the points different from the first embodiment will be described in detail. Further, in the following, the same reference numerals will be given to the configurations and members common to those of the first embodiment, and detailed description thereof will be omitted.

FIG. 8 is a schematic configuration diagram showing a projector of this embodiment.
As shown in FIG. 8, the projector 1A includes a red light illumination device 101R, a green light illumination device 101G, a blue light illumination device 101B, an optical modulator 400R, 400G, 400B, and a field lens 300R, 300G. , 300B, a cross dichroic prism 500, and a projection optical system 600.

In the present embodiment, each of the red light illuminating device 101R, the green light illuminating device 101G, and the blue light illuminating device 101B corresponds to the "illuminating device" in the claims.

The projector 1A generally operates as follows.
The red light R composed of the red laser light emitted from the red light illumination device 101R is incident on the light modulation device 400R via the field lens 300R and modulated. Similarly, the green light G composed of the green laser light emitted from the green light illumination device 101G is incident on the light modulation device 400G via the field lens 300G and modulated. The blue light B composed of the blue laser light emitted from the blue light illumination device 101B is incident on the light modulation device 400B via the field lens 300B and modulated.

Hereinafter, each component of the projector 1A will be described.
The red light illuminating device 101R, the green light illuminating device 101G, and the blue light illuminating device 101B differ only in the color of the emitted light, and the device configurations are the same. As an example, a laser light source for red light emits red light R composed of laser light having a peak wavelength in a wavelength range of approximately 585 nm to 720 nm. The laser light source for green light emits green light G composed of laser light having a peak wavelength in a wavelength range of approximately 495 nm to 585 nm. The laser light source for blue light emits blue light B composed of laser light having a peak wavelength in a wavelength range of approximately 380 nm to 495 nm.

Therefore, in the following, only the blue light lighting device 101B will be described, and the red light lighting device 101R and the green light lighting device 101G will be omitted.

FIG. 9 is a diagram showing a schematic configuration of the blue light lighting device 101B. In FIG. 9, for convenience of explanation, the field lens 300B and the optical modulation device 400B are also shown.
As shown in FIG. 9, the blue light illumination device 101B includes a light source device 3 and a uniform optical system 112. In the present embodiment, the light source device 3 includes one or a plurality of light source devices according to any one of the first embodiment or the first to third modifications. Based on such a configuration, the light source device 3 emits blue light B composed of a plurality of blue laser lights.

The homogenizing optical system 112 includes a lens integrator 115 and a superposed lens 116 provided after the lens integrator 115. The configuration of the uniform optical system 112 is not limited to the configuration using a lens integrator, and for example, a light diffusing element such as a diffraction element may be used.

The lens integrator 115 includes a first lens array 124 and a second lens array 125 provided after the first lens array 124.
The first lens array 124 has a plurality of first small lenses 124a. The plurality of first small lenses 124a are arranged in a matrix of a plurality of rows and a plurality of columns in a plane orthogonal to the illumination optical axis AX1. The first lens array 124 divides the blue light B emitted from the light source device 3 into a plurality of partial luminous fluxes.

The shape of each of the first small lenses 124a is substantially similar to the shape of the image forming region of the optical modulation device 400B. As a result, each of the partial luminous fluxes emitted from the first lens array 124 can be efficiently incident on the image forming region of the light modulation apparatus 400B. Therefore, high light utilization efficiency can be realized.

The second lens array 125 has a plurality of second small lenses 125a. The shape of each of the plurality of first small lenses 124a is the same as the shape of each of the plurality of second small lenses 125a. The first small lens 124a and the second small lens 125a have a one-to-one correspondence with each other, and the plurality of second small lenses 125a are arranged in a matrix of multiple rows and columns in a plane orthogonal to the illumination optical axis AX1. Has been done.

The second lens array 125, in cooperation with the superposed lens 116 and the field lens 300B in the subsequent stage, connects the image of the first small lens 124a of the first lens array 124 to the vicinity of the image forming region of the liquid crystal light valve 102B for blue light. It has a function to make an image.

The superimposing lens 116 superimposes a plurality of light fluxes emitted from the second lens array 125 on the light modulator 400B which is an illuminated region in cooperation with the field lens 300B. As a result, the intensity distribution of the light that illuminates the optical modulation device 400B is made uniform, and the axial symmetry around the illumination optical axis AX1 is enhanced.

By the way, the blue light illumination device 101B of the present embodiment includes a member (for example, a uniform optical system 112) in addition to the light source device 3 as a component. Therefore, a part of the blue light B emitted from the light source device 3 may be reflected by some member and returned to the light source device 3 to be irradiated as light. However, according to the light source device 3, deterioration of the adhesive material 18 due to the return light is reduced.

Therefore, according to the blue light illumination device 101B of the present embodiment, the light modulation device 400B can be stably irradiated with the blue light B. Similarly, the red light illumination device 101R can stably irradiate the light modulator 400R with the red light R, and the green light illumination device 101G can stably irradiate the light modulator 400G with the green light G. ..

As described above, the projector 1A of the present embodiment includes the red light lighting device 101R, the green light lighting device 101G, and the blue light lighting device 101B, so that a color image having stable brightness can be projected. ..

The present invention is not limited to the contents of the above-described embodiment, and can be appropriately modified without departing from the gist of the invention.

For example, in the above embodiment, the cover member 15 is integrally molded with the collimating lens unit 25, but the cover member may be a glass plate having no lens function as long as it has light transmission. ..

Further, in the above embodiment, a projector provided with three optical modulation devices 400R, 400G, and 400B is exemplified, but it can also be applied to a projector that displays a color image with one optical modulation device. Further, a digital mirror device may be used as the optical modulation device.

Further, in the above embodiment, an example of applying the lighting device according to the present invention to a projector is shown, but the present invention is not limited to this. The lighting device according to the present invention can also be applied to lighting equipment such as automobile headlights.

1,1A ... Projector, 2,2A, 2B, 2C, 3 ... Light source device, 10 ... Support member,
11a ... First surface, 12 ... Light emitting element, 15 ... Cover member, 16, 16A, 16B ... Light shielding member, 17 ... Optical element, 18 ... Adhesive material (bonding member), 30 ... Rotating fluorescent plate (wavelength conversion element), 70 ... light guide member, 71 ... hollow part, 72 ... protruding part, 100 ... lighting device, 101B ... blue light lighting device, 101G ... green light lighting device, 101R ... red light lighting device, 102B ... blue light Liquid crystal light valve, 112 ... uniform optical system, 400B, 400G, 400R ... optical modulator, 600 ... projection optical system.

Claims (6)

A support member having a first surface and
A cover member provided on the first surface side of the support member and having a light transmitting portion, and a cover member.
A light emitting element provided between the support member and the cover member,
A joining member that joins the support member and the cover member,
A light-shielding member provided on the cover member side of the joining member and
A light guide member having a hollow portion through which light emitted from the light emitting element passes is provided .
The cover member is provided between the light-shielding member and the support member.
The light guide member has a light-shielding projecting portion projecting into the hollow portion.
The protruding portion is a light source device that functions as the light- shielding member . The light source device according to claim 1, wherein the light transmitting portion has a refractive power. The light source device according to claim 1 or 2, wherein the cover member is urged in the direction of the support member by the light-shielding member. The light source device according to any one of claims 1 to 3 .
A lighting device including a wavelength conversion element into which light emitted from the light source device is incident. The lighting device according to claim 4 and
An optical modulation device that forms image light by modulating the light from the lighting device according to image information, and
A projector including a projection optical system for projecting the image light. The light source device according to any one of claims 1 to 3 .
A uniform optical system in which the light emitted from the light source device is incident, and
An optical modulator that forms image light by modulating the light from the uniform optical system according to image information, and
A projector including a projection optical system for projecting the image light.

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