JP6790546B2 - Wavelength converters, light source devices and projectors - Google Patents

Description

The present invention relates to wavelength conversion elements, light source devices and projectors.

As a light source device used for a projector or the like, a light source device has been proposed in which an excitation light emitted from a light source such as a semiconductor laser is irradiated to a phosphor and the fluorescent light obtained from the phosphor is used.

For example, Patent Document 1 below discloses a light source device including an excitation light source, a red light emitting device, a green light emitting device, and a blue light emitting device. The light emitting device of each color includes a base material having light transmission, a dichroic layer, and a phosphor layer. The excitation light emitted from the excitation light source sequentially passes through the base material and the dichroic layer, and then enters the phosphor layer. Of the fluorescent light emitted from the phosphor layer in all directions, the fluorescent light traveling toward the base material side is reflected by the dichroic layer and is taken out on the side opposite to the base material.

JP-A-2010-86815

In the light source device of Patent Document 1, in order to take out fluorescent light in a desired direction, that is, on the side opposite to the base material, a dichroic layer that transmits excitation light and reflects fluorescent light is a base material and a phosphor layer. It is provided between. However, of the fluorescent light incident on the dichroic layer, the P-polarized light component incident at an angle close to the Brewster angle passes through the dichroic layer. Therefore, the light source device of Patent Document 1 has a problem that some components of the fluorescent light cannot be taken out in a desired direction.

One aspect of the present invention has been made to solve the above problems, and one object of the present invention is to provide a wavelength conversion element capable of increasing the amount of light extracted in a desired direction. One aspect of the present invention is to provide a light source device including the above wavelength conversion element. One aspect of the present invention is to provide a projector provided with the above-mentioned light source device.

In order to achieve the above object, the wavelength conversion element of one aspect of the present invention is provided on the light incident end surface side of the wavelength conversion layer and the light incident end surface, and is provided on the light incident end surface. A translucent member having a support surface including an inclined portion, and a first reflecting portion provided along the supporting surface and reflecting fluorescent light emitted from the wavelength conversion layer are provided. At least a part of the first reflecting portion is composed of a dichroic film that transmits excitation light for exciting the wavelength conversion layer, and the translucent member has the dichroic film and the excitation light. The light incident end faces are arranged so as to pass through the light incident end faces in this order and enter the wavelength conversion layer, and the plane including the light incident end faces is used as a reference plane, and the reference plane and the first When the distance between the reference surface and the first reflection portion is defined as the distance between the reference surface and the first reflection portion, the inclined portion is the reference surface and the first reflection portion in the peripheral region of the first reflection portion. Is inclined with respect to the light incident end surface so that the distance from the light incident portion is smaller than the distance between the reference surface and the first reflecting portion in the central region of the first reflecting portion.

In the wavelength conversion element of one aspect of the present invention, the first reflecting portion, which is at least partially formed of a dichroic film, is provided along the support surface including the inclined portion of the translucent member. Therefore, the component that is incident on the dichroic film at an angle close to the Brewster angle and transmits through the dichroic film is smaller than that of the conventional wavelength conversion element. As a result, a large amount of the fluorescent light generated in the wavelength conversion layer can be extracted in a desired direction, that is, in the direction opposite to the light incident end face of the wavelength conversion layer.

In the wavelength conversion element of one aspect of the present invention, an air layer may be provided between the translucent member and the light incident end face.
According to this configuration, of the fluorescent light generated by the wavelength conversion layer, the component that is totally reflected by the light incident end face as compared with the case where the air layer is not provided between the translucent member and the light incident end face. Will increase. As a result, it is possible to further increase the components of the fluorescent light generated in the wavelength conversion layer that can be extracted in a desired direction.

In the wavelength conversion device of one aspect of the present invention, the support surface may include a flat surface.
According to this configuration, the uniformity of the optical characteristics of the region formed on the flat surface of the first reflecting portion is higher than that when the first reflecting portion is provided on the curved surface.

In the wavelength conversion element of one aspect of the present invention, the support surface may include a curved surface.
According to this configuration, among the fluorescent light generated by the wavelength conversion layer, the number of components that can be extracted in a desired direction is larger than that of the conventional wavelength conversion element.

In the wavelength conversion element of one aspect of the present invention, the translucent member is a plano-convex lens, the flat surface of the plano-convex lens faces the light incident end surface, and the flat surface is the light incident surface. It may be in thermal contact with the end face.
According to this configuration, the heat generated in the wavelength conversion layer can be released through the translucent member.

In the wavelength conversion element of one aspect of the present invention, the refractive index of the translucent member may be substantially equal to that of the phosphor constituting the wavelength conversion layer.
According to this configuration, reflection at the interface between the wavelength conversion layer and the translucent member is suppressed, and light loss due to interfacial reflection can be reduced.

In the wavelength conversion element of one aspect of the present invention, the first reflecting portion further includes a reflecting surface made of a metal material, and the dichroic film has the wavelength when viewed from a direction perpendicular to the light incident end surface. It may be provided in a region including the central region of the conversion layer, and the reflective surface may be provided at least outside the dichroic film.
In general, a dichroic film has an incident angle dependence of reflectance, whereas a reflective surface made of a metal material does not have an incident angle dependence of reflectance. Therefore, if the first reflecting portion is composed of only the dichroic film, the fluorescent light passes through the dichroic film depending on the incident angle, so that the efficiency of extracting the fluorescent light in a desired direction is lowered. In that respect, according to the above configuration, since the reflecting surface made of a metal material is provided in the region where the incident angle of the fluorescent light tends to be large, the efficiency of extracting the fluorescent light in a desired direction can be improved.

The wavelength conversion element of one aspect of the present invention may further include a structure that overlaps the reflecting surface when viewed from a direction perpendicular to the light incident end surface, and the supporting surface may further include the light transmitting end surface. The sex member may be provided on the side opposite to the light incident end surface, and the reflecting surface may be provided on the structure.
According to this configuration, since the dichroic film can be provided on the translucent member and the reflective surface made of a metal material can be provided on the structure, the optical characteristics of the dichroic film and the reflective surface can be improved. Further, it is possible to simplify the film forming process when forming the dichroic film on the surface of the translucent member opposite to the light incident end surface.

In the wavelength conversion element of one aspect of the present invention, the reflective surface may be composed of a reflective film provided on the structure.
According to this configuration, a reflective surface having a desired reflectance can be obtained by appropriately selecting a reflective film.

In the wavelength conversion element of one aspect of the present invention, the support surface may be provided on the light incident end surface side of the translucent member.
According to this configuration, the fluorescent light emitted from the wavelength conversion layer toward the dichroic film is incident on the dichroic film without passing through the translucent member. As a result, the loss of fluorescent light due to the internal absorption of the translucent member can be suppressed.

The light source device of one aspect of the present invention includes a wavelength conversion element of one aspect of the present invention and an excitation light source that emits the excitation light.
According to this configuration, by providing the wavelength conversion element of one aspect of the present invention, it is possible to provide a light source device having high light utilization efficiency.

The light source device according to one aspect of the present invention includes a base material having a first surface and a second surface facing the first surface, a condensing optical system, a second reflecting portion, and the like. The base material further comprises a hole that penetrates the base material between the first surface and the second surface, and the wavelength conversion layer is provided in the hole to transmit light. The sex member is provided on the first surface side of the base material, the condensing optical system is provided on the second surface side of the base material, and the second reflecting portion is the base material. It may be provided between the light source and the wavelength conversion layer.
According to this configuration, it is easy to balance the distance between the light incident end face of the wavelength conversion layer and the dichroic film and the distance between the light emission end face of the wavelength conversion layer and the condensing optical system. Further, since the second reflecting portion is provided between the base material and the wavelength conversion layer, the component of the fluorescent light generated by the wavelength conversion layer that advances toward the base material is the second reflecting portion. Is reflected by. Therefore, as compared with the case where the second reflecting portion is not provided, the amount of components that are absorbed by the base material and cause loss is reduced. Further, since the number of components advancing inside the base material is reduced, it is not necessary to increase the size of the translucent member and the condensing optical system. Further, since the amount of light emitted from a predetermined region, that is, the light emitted by a predetermined etendue increases, the amount of light that can be effectively used in the optical system increases.

In the light source device of one aspect of the present invention, the contour of the light incident end surface is located inside the contour of the dichroic film when viewed from a direction perpendicular to the plane, and the dichroic of the fluorescent light It may further include a third reflecting portion that reflects the component reflected by the film and traveling toward the outer region of the light incident end face toward the dichroic film.
According to this configuration, the component of the fluorescent light that is reflected by the dichroic film and travels toward the outer region of the light incident end face can be reflected again by the dichroic film, so that the proportion of the component that becomes a loss can be determined. It can be made smaller.

The projector according to one aspect of the present invention includes a light source device according to one aspect of the present invention, an optical modulation device that modulates light emitted from the light source device according to image information to generate image light, and the image. It includes a projection optical system that projects light.
Since the projector according to one aspect of the present invention includes the light source device according to one aspect of the present invention, it is possible to realize a projector having high light utilization efficiency.

It is a schematic block diagram of the projector of 1st Embodiment of this invention. It is a schematic block diagram of the light source apparatus of 1st Embodiment of this invention. It is sectional drawing which cut the wavelength conversion element of 1st Embodiment of this invention by the plane including the illumination optical axis. It is a top view of the wavelength conversion element seen from the incident side of the excitation light. It is sectional drawing of the wavelength conversion element of 2nd Embodiment of this invention. It is sectional drawing of the wavelength conversion element of 3rd Embodiment of this invention. It is sectional drawing of the wavelength conversion element of 4th Embodiment of this invention. It is sectional drawing of the wavelength conversion element of 5th Embodiment of this invention. It is sectional drawing of the wavelength conversion element of 6th Embodiment of this invention. It is sectional drawing of the wavelength conversion element of 7th Embodiment of this invention.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.
In the drawings used in the following description, in order to make the features easier to understand, the featured parts may be enlarged for convenience, and the dimensional ratios of each component may not be the same as the actual ones. Absent.

(projector)
The projector of this embodiment is an example of a projector using three transmissive liquid crystal light bulbs.
FIG. 1 is a schematic configuration diagram showing a projector of the present embodiment. FIG. 2 is a schematic configuration diagram showing the light source device of the present embodiment.

As shown in FIG. 1, the projector 1 includes a light source device 2, a color separation optical system 3, an optical modulator 4R, an optical modulator 4G, an optical modulator 4B, a photosynthetic optical system 5, and a projection optical system 6. , Is equipped. The light source device 2 irradiates the illumination light WL. The color separation optical system 3 separates the illumination light WL from the light source device 2 into red light LR, green light LG, and blue light LB. The optical modulation device 4R, the optical modulation device 4G, and the optical modulation device 4B modulate the red light LR, the green light LG, and the blue light LB according to the image information to form the image light of each color. The photosynthetic optical system 5 synthesizes image light of each color from each of the photomodulators 4R, 4G, and 4B. The projection optical system 6 projects the synthesized image light from the photosynthetic optical system 5 toward the screen SCR.

The light source device 2 includes a part of the blue excitation light emitted from the semiconductor laser without wavelength conversion and the yellow fluorescent light generated by the wavelength conversion of the excitation light by the phosphor. , Emit a combined white illumination light (white light) WL. The light source device 2 emits illumination light WL adjusted to have a substantially uniform illuminance distribution toward the color separation optical system 3. The specific configuration of the light source device 2 will be described later.

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

The first dichroic mirror 7a separates the illumination light WL emitted from the light source device 2 into red light LR and light in which green light LG and blue light LB are mixed. Therefore, the first dichroic mirror 7a has a property of transmitting red light LR and reflecting green light LG and blue light LB. The second dichroic mirror 7b separates the light obtained by mixing the green light LG and the blue light LB into the green light LG and the blue light LB. Therefore, the second dichroic mirror 7b has a property of reflecting the green light LG and transmitting the blue light LB.

The first reflection mirror 8a is arranged in the optical path of the red light LR, and reflects the red light LR transmitted through the first dichroic mirror 7a toward the light modulator 4R. The second reflection mirror 8b and the third reflection mirror 8c are arranged in the optical path of the blue light LB, and guide the blue light LB transmitted through the second dichroic mirror 7b to the light modulator 4B. The second dichroic mirror 7b reflects the green light LG toward the light modulator 4G.

The first relay lens 9a and the second relay lens 9b are arranged after the second dichroic mirror 7b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b compensate for the optical loss of the blue light LB due to the optical path length of the blue light LB being longer than the optical path length of the red light LR and the green light LG.

Each of the optical modulation device 4R, the optical modulation device 4G, and the optical modulation device 4B is composed of a liquid crystal panel. Each of the optical modulator 4R, the optical modulator 4G, and the optical modulator 4B passes the red light LR, the green light LG, and the blue light LB while passing through each of the red light LR, the green light LG, and the blue light LB. Each of the LBs is modulated according to the image information to form the image light corresponding to each color. Polarizing plates (not shown) are arranged on the light incident side and the light emitting side of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, respectively.

On the light incident side of each of the light modulator 4R, the optical modulator 4G, and the optical modulator 4B, red light LR and green light incident on each of the optical modulator 4R, the optical modulator 4G, and the optical modulator 4B A field lens 10R, a field lens 10G, and a field lens 10B that parallelize each of the LG and the blue light LB are provided.

The photosynthetic optical system 5 is composed of a cross dichroic prism. The photosynthetic optical system 5 synthesizes image light of each color from each of the photomodulator 4R, the photomodulator 4G, and the photomodulator 4B, and emits the synthesized image light toward the projection optical system 6.

The projection optical system 6 is composed of a projection lens group. The projection optical system 6 magnifies and projects the image light synthesized by the photosynthetic optical system 5 toward the screen SCR. As a result, an enlarged color image (image) is displayed on the screen SCR.

(Light source device)
Next, the light source device 2 of the present embodiment will be described.
FIG. 2 is a diagram showing a schematic configuration of the light source device 2.
As shown in FIG. 2, the light source device 2 includes an excitation light source 110, an afocal optical system 11, a homogenizer optical system 12, a first condensing optical system 20, a wavelength conversion element 30, and a second collection. It includes an optical optical system 60, an integrator optical system 125, and a polarization conversion element 140.

The excitation light source 110 is composed of a plurality of semiconductor lasers 110A that emit blue excitation light B composed of laser light. The peak of the emission intensity of the excitation light B is, for example, 445 nm. The plurality of semiconductor lasers 110A are arranged in an array in one plane orthogonal to the illumination optical axis 100ax. As the excitation light source 110, a semiconductor laser that emits blue light having a wavelength other than 445 nm, for example, 455 nm or 460 nm, can also be used.

The afocal optical system 11 includes, for example, a convex lens 11a and a concave lens 11b. The afocal optical system 11 reduces the diameter of a luminous flux composed of a plurality of laser beams emitted from the excitation light source 110. A collimator optical system may be arranged between the afocal optical system 11 and the excitation light source 110 to convert the excitation light incident on the afocal optical system 11 into a parallel luminous flux.

The homogenizer optical system 12 includes, for example, a first multi-lens array 12a and a second multi-lens array 12b. The homogenizer optical system 12 makes the light intensity distribution of the excitation light uniform on the wavelength conversion layer described later, that is, a so-called top hat distribution. The homogenizer optical system 12 superimposes a plurality of small luminous fluxes emitted from the plurality of lenses of the first multi-lens array 12a on the wavelength conversion layer together with the first condensing optical system 20. As a result, the light intensity distribution of the excitation light B irradiated on the wavelength conversion layer is made uniform.

The first condensing optical system 20 includes, for example, a first lens 20a and a second lens 20b. The first condensing optical system 20 is arranged in the optical path from the homogenizer optical system 12 to the wavelength conversion element 30, and condenses the excitation light B so that it is incident on the wavelength conversion layer of the wavelength conversion element 30. In the present embodiment, the first lens 20a and the second lens 20b are each composed of a convex lens.

The second condensing optical system 60 includes, for example, a first collimating lens 62 and a second collimating lens 64. The second condensing optical system 60 substantially parallelizes the light emitted from the wavelength conversion element 30. The first collimating lens 62 and the second collimating lens 64 are each composed of a convex lens.

The integrator optical system 125 includes, for example, a first lens array 120, a second lens array 130, and a superposed lens 150. The first lens array 120 has a plurality of first lenses 122 for dividing the light emitted from the second condensing optical system 60 into a plurality of partial luminous fluxes. The plurality of first lenses 122 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

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

The polarization conversion element 140 converts the light emitted from the second lens array 130 into linearly polarized light. The polarization conversion element 140 includes, for example, a polarization separation membrane and a retardation plate (both not shown).

The superimposing lens 150 collects each partial luminous flux emitted from the polarization conversion element 140 and superimposes it on the vicinity of the image forming region of the light modulation device 400R, the light modulation device 400G, and the light modulation device 400B. The first lens array 120, the second lens array 130, and the superimposing lens 150 constitute an integrator optical system 125 that makes the intensity distribution of light from the wavelength conversion element 30 uniform.

(Wavelength conversion element)
Next, the wavelength conversion element of this embodiment will be described.
FIG. 3 is a cross-sectional view of the wavelength conversion element 30 cut along a plane including the illumination optical axis 100ax of FIG. FIG. 4 is a plan view of the wavelength conversion element 30 as seen from the incident side of the excitation light B.
As shown in FIGS. 3 and 4, the wavelength conversion element 30 includes a base material 31, a wavelength conversion layer 32, a translucent member 33, a dichroic film 34 forming a first reflection portion, and a second. It includes a reflective film 35 and a third reflective film 36. That is, this embodiment is an example in which the first reflective portion is made of a dichroic film 34. The second reflective film 35 of the present embodiment corresponds to the second reflective portion within the scope of the claims. The third reflective film 36 of the present embodiment corresponds to the third reflective portion in the claims. The second condensing optical system 60 corresponds to the condensing optical system in the claims.

The base material 31 is made of a rectangular plate and has a first surface 31a and a second surface 31b facing each other. The second condensing optical system 60 is provided on the second surface 31b side of the base material 31. The base material 31 is provided with a hole 31h that penetrates the base material 31 between the first surface 31a and the second surface 31b. When viewed from a direction perpendicular to the first surface 31a of the base material 31, the shape of the hole 31h is rectangular. The base material 31 may be made of a material having translucency such as glass or quartz, or may be made of a material having no translucency such as metal. In the case of a metal material, it is desirable to use a metal having excellent heat dissipation such as aluminum and copper.

The wavelength conversion layer 32 is provided inside the hole 31h of the base material 31. The wavelength conversion layer 32 includes phosphor particles (not shown) that convert blue excitation light B into yellow fluorescent light Y and emit it. The wavelength conversion layer 32 has a light incident end surface 32a that is substantially flush with the first surface 31a of the base material 31, and a light emitting end surface 32b that is substantially flush with the second surface 31b of the base material 31. Hereinafter, for convenience of explanation, a virtual plane including the light incident end surface 32a of the wavelength conversion layer 32 is referred to as a reference plane P. When viewed from the direction perpendicular to the reference plane P, the shape of the wavelength conversion layer 32 is a rectangle reflecting the shape of the holes 31h of the base material 31.

As the phosphor particles, for example, a YAG (yttrium aluminum garnet) -based phosphor is used. The material for forming the phosphor particles may be one kind, or a mixture of particles formed by using two or more kinds of materials may be used. It is preferable to use a wavelength conversion layer 32 having excellent heat resistance and surface processability. As such a wavelength conversion layer 32, a phosphor layer in which phosphor particles are dispersed in an inorganic binder such as alumina, a phosphor layer in which phosphor particles are sintered without using a binder, and the like are preferably used.

The translucent member 33 is provided on the light incident end surface 32a side of the wavelength conversion layer 32, that is, on the first surface 31a side of the base material 31. The translucent member 33 of the first embodiment is composed of a plano-convex lens made of a translucent material such as glass, quartz, and sapphire. The translucent member 33 has a flat surface 33f and a convex surface 33d corresponding to the inclined portion described in the claims. The flat surface 33f of the translucent member 33 faces the light incident end surface 32a of the wavelength conversion layer 32. A translucent heat conductive member 37 is provided between the translucent member 33 and the wavelength conversion layer 32, and the translucent member 33 and the wavelength conversion layer 32 are in thermal contact with each other. Further, a second reflective film 36 and a heat transfer member (not shown) are provided between the translucent member 33 and the base material 31, and the translucent member 33 and the base material 31 are in thermal contact with each other. doing. As the heat transfer member, grease, adhesive, solder, heat conductive sheet and the like are used.

As shown in FIG. 3, the translucent member 33 has a hemispherical shape, and the convex surface 33d of the translucent member 33 has a hemispherical shape. That is, the convex surface 33d has a curved surface. When viewed from a direction perpendicular to the reference plane P, the shape of the translucent member 33 is circular, and the central portion of the translucent member 33 overlaps with the wavelength conversion layer 32. The translucent member 33 is arranged so that the excitation light B transmits the dichroic film 34 and the light incident end face 32a, which will be described later, in this order and is incident on the wavelength conversion layer 32. In the present specification, the distance between the reference surface P and the dichroic film 34 in the direction perpendicular to the reference surface P is defined as the distance between the reference surface P and the dichroic film 34. In the convex surface 33d, the distance G2 between the reference surface P and the dichroic film 34 in the peripheral region of the dichroic film 34 is smaller than the distance G1 between the reference surface P and the dichroic film 34 in the central region of the dichroic film 34 or the wavelength conversion layer 32. It is inclined with respect to the light incident end face 32a so as to be.

It is desirable that the refractive index of the translucent member 33 is substantially equal to the refractive index of the wavelength conversion layer 32. When the refractive index of the translucent member 33 is substantially equal to the refractive index of the wavelength conversion layer 32, the loss due to reflection when the excitation light or the fluorescent light passes through the interface between the translucent member 33 and the wavelength conversion layer 32 is minimized. It can be suppressed to the limit. As a result, more fluorescent light can be extracted in a desired direction.

As shown in FIG. 3, the dichroic film 34 is provided on the convex surface 33d of the translucent member 33. The convex surface 33d is a support surface that includes an inclined portion inclined with respect to the light incident end surface 32a and supports the dichroic film 34. That is, the dichroic film 34 is provided along the convex surface 33d, which is the support surface of the translucent member 33. Therefore, the dichroic film 34 has a hemispherical shape that reflects the shape of the convex surface 33d of the translucent member 33.

When viewed from a direction perpendicular to the reference plane P, the dichroic film 34 has a dichroic film 34 in which the distance between the reference plane P and the dichroic film 34 in the peripheral region of the wavelength conversion layer 32 is the same as the reference plane P in the central region of the wavelength conversion layer 32. It is formed in a shape that is smaller than the distance G1 from the film 34. The dichroic film 34 has a property of transmitting the blue excitation light B emitted from the excitation light source 110 and reflecting the yellow fluorescent light Y generated by the wavelength conversion layer 32.

As shown in FIG. 3, the second reflective film 35 is provided between the base material 31 and the wavelength conversion layer 32. That is, the second reflective film 35 is provided on the inner peripheral surface of the hole 31h of the base material 31. The second reflective film 35 reflects the fluorescent light Y generated by the wavelength conversion layer 32. It is desirable that a metal material having high light reflectance such as aluminum and silver is used for the second reflective film 35.

The third reflective film 36 is provided between the base material 31 and the translucent member 33. Further, as shown in FIG. 4, the contour 32R of the light incident end surface 32a is located inside the contour 34R of the dichroic film 34 when viewed from a direction perpendicular to the reference plane P. The third reflective film 36 is provided between the contour 32R of the light incident end surface 32a and the contour 34R of the dichroic film 34. The third reflective film 36 reflects the component of the fluorescent light Y that is reflected by the dichroic film 34 and travels toward the outer region of the light incident end face 32a toward the dichroic film 34. As with the second reflective film 35, it is desirable that a metal material having a high reflectance such as aluminum or silver is used for the third reflective film 36.

When the base material 31 is made of a material such as aluminum, the surface of the base material 31 has light reflectivity, so that the second reflective film 35 and the third reflective film 36 are not necessarily provided. It does not have to be.

In the conventional wavelength conversion element, the dichroic film is provided in a plane on the surface of the phosphor layer. Therefore, among the fluorescent light incident on the dichroic layer, the P-polarized light component incident on the angle close to the Brewster's angle passes through the dichroic layer, so that there is a problem that it cannot be taken out from a predetermined light emitting end face.

On the other hand, in the wavelength conversion element 30 of the first embodiment, the dichroic film 34 has a hemispherical shape that reflects the shape of the convex surface 33d. Therefore, for example, the fluorescent light Y1 in FIG. 3 is incident on the dichroic film parallel to the reference plane P at an angle close to the Brewster's angle and transmitted in the conventional wavelength conversion element 30, but is transmitted in the wavelength conversion element 30. , It is incident on the dichroic film 34 at an angle smaller than the Brewster's angle and reflected. As a result, the proportion of the fluorescent light Y that is not reflected by the dichroic film 34 and is lost can be reduced as compared with the conventional case. As a result, it is possible to provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one.

Further, since the wavelength conversion element 30 includes the third reflective film 36, for example, as shown in FIG. 3, the fluorescent light Y2 reflected by the dichroic film 34 and travels toward the outer region of the light incident end surface 32a. Is reflected by the third reflective film 36, and is reflected again by the dichroic film 34 toward the light incident end surface 32a. As a result, the proportion of the component of the fluorescent light Y that can be taken out in a desired direction can be further increased.

The second reflective film 35 reflects the component directly incident from the wavelength conversion layer 32 and the component reflected by the dichroic film 34. Further, the third reflective film 36 reflects a component that is reflected by the dichroic film 34 and travels toward the outer region of the light incident end surface 32a. As a result, the area of the region where the fluorescent light Y is emitted from the wavelength conversion element 30 toward the second surface 31b does not become larger than the area of the light emission end surface 32b. That is, the wavelength conversion element 30 suppresses the increase in etendue. As a result, it is possible to realize a light source device having high light utilization efficiency.

Further, since the translucent member 33 and the wavelength conversion layer 32 are in thermal contact with each other via the heat transfer member, the heat generated in the wavelength conversion layer 32 is transferred not only to the base material 31 but also to the translucent member 33. Can also be transmitted to dissipate heat.

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projector and the light source device of the second embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 5 is a cross-sectional view of the wavelength conversion element of the second embodiment. FIG. 5 corresponds to FIG. 3 in the first embodiment.
In FIG. 5, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the wavelength conversion element of the first embodiment, a plano-convex lens was used as the translucent member. On the other hand, as shown in FIG. 5, in the wavelength conversion element 40 of the second embodiment, a convex meniscus lens is used as the translucent member 41.
Hereinafter, the concave surface of the convex meniscus lens constituting the translucent member 41 is referred to as a first curved surface 41a. The first curved surface 41a corresponds to the inclined portion described in the claims.

The translucent member 41 is provided so that the first curved surface 41a faces the light incident end surface 32a of the wavelength conversion layer 32. Therefore, an air layer 42 is provided between the translucent member 41 and the light incident end surface 32a of the wavelength conversion layer 32.

The dichroic film 34 is provided on the first curved surface 41a of the translucent member 41. The first curved surface 41a functions as a support surface for the dichroic film 34. Therefore, the dichroic film 34 has a shape that reflects the shape of the first curved surface 41a of the translucent member 41. On the first curved surface 41a, the distance G2 between the reference surface P and the dichroic film 34 in the peripheral region of the dicroic film 34 is smaller than the distance G1 between the reference surface P and the dicroic film 34 in the central region of the dicroic film 34. In addition, it is inclined with respect to the light incident end face 32a. Further, in the dichroic film 34, the distance between the reference surface P and the dichroic film 34 in the peripheral region of the wavelength conversion layer 32 is smaller than the distance G1 between the reference surface P and the dichroic film 34 in the central region of the wavelength conversion layer 32. .. Other configurations are the same as those in the first embodiment.

The second embodiment is also similar to the first embodiment in that it is possible to provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The effect is obtained.

In particular, in the case of the second embodiment, since the air layer 42 exists between the light incident end surface 32a of the wavelength conversion layer 32 and the translucent member 41, for example, as compared with the case where the air layer does not exist, for example. Like the fluorescent light Y3 in FIG. 5, among the fluorescent light Y generated by the wavelength conversion layer 32, a large amount of components are totally reflected by the light incident end surface 32a. Further, the fluorescent light Y emitted from the wavelength conversion layer 32 toward the dichroic film 34 is incident on the dichroic film 34 without passing through the translucent member 41. As a result, the loss of the fluorescent light Y due to the internal absorption of the translucent member 41 can be suppressed. As a result, it is possible to further increase the components of the fluorescent light Y generated in the wavelength conversion layer that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction.

[Third Embodiment]
Hereinafter, the third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projector and the light source device of the third embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 6 is a cross-sectional view of the wavelength conversion element of the third embodiment. FIG. 6 corresponds to FIG. 3 in the first embodiment.
In FIG. 6, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, the wavelength conversion element 50 of the third embodiment includes a shell-shaped translucent member 51. The translucent member 51 has a first surface 51a which is a concave surface and a convex surface. The first surface 51a has a substantially hemispherical shape. Specifically, the first surface 51a has a flat surface 51b at the center thereof and a curved surface portion 51c forming a part of a spherical surface at the peripheral edge thereof. The curved surface portion 51c corresponds to the inclined portion described in the claims. The curvature of the curved surface portion 51c of the first surface 51a and the curvature of the curved surface portion of the convex surface may or may not be equal. As in the present embodiment, the translucent member 51 does not necessarily have to have a lens shape.

The translucent member 51 is provided so that the first surface 51a faces the light incident end surface 32a of the wavelength conversion layer 32. Therefore, an air layer 42 is provided between the translucent member 51 and the light incident end surface 32a of the wavelength conversion layer 32.

The dichroic film 34 is provided on the first surface 51a of the translucent member 51. The first surface 51a functions as a support surface for the dichroic film 34. Therefore, the dichroic film 34 reflects the shape of the first surface 51a of the translucent member 51, has a flat portion 34b in the central region, and has an inclined portion 34c (curved surface portion) in the peripheral region. In the curved surface portion 51c, the distance G2 between the reference surface P and the dichroic film 34 in the peripheral region of the dichroic film 34 is smaller than the distance G1 between the reference surface P and the dichroic film 34 in the central region of the dichroic film 34. It is inclined with respect to the light incident end face 32a. Further, the distance between the reference surface P and the dichroic film 34 in the peripheral region of the wavelength conversion layer 32 is smaller than the distance G1 between the reference surface P and the dichroic film 34 in the central region of the wavelength conversion layer 32. Other configurations are the same as those in the first embodiment.

Also in the third embodiment, the first and second embodiments can provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The same effect as is obtained.

Further, since the fluorescent light Y emitted from the wavelength conversion layer 32 toward the dichroic film 34 is incident on the dichroic film 34 without passing through the translucent member 51, it is possible to further increase the components that can be taken out in a desired direction. The same effect as that of the second embodiment can be obtained.

Further, in the case of the third embodiment, since the translucent member 51 has a flat portion 51b in the central region, the translucent member 51 can be stably placed, and the translucent member 51 is used as a base material. Workability when fixing to 31 is improved. Further, forming the dichroic film on a flat surface is easier than forming it on a curved surface. Therefore, the optical characteristics of the dichroic film 34 as a whole are higher than those in the case where the translucent member 51 does not include the flat portion 51b.

[Fourth Embodiment]
Hereinafter, the fourth embodiment of the present invention will be described with reference to FIG. 7.
The basic configuration of the projector and the light source device of the fourth embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 7 is a cross-sectional view of the wavelength conversion element of the fourth embodiment. FIG. 7 corresponds to FIG. 3 in the first embodiment.
In FIG. 7, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the wavelength conversion elements of the first to third embodiments, the first reflecting portion is composed of only the dichroic film 34. On the other hand, in the wavelength conversion elements of the fourth to sixth embodiments, the first reflecting portion is composed of the dichroic film 34 and the reflecting surface 71r. Further, in the fourth embodiment, the reflective surface 71r is composed of a reflective film 71 made of a metal material.

As shown in FIG. 7, the wavelength conversion element 70 of the fourth embodiment includes a base material 31, a wavelength conversion layer 32, a translucent member 33, a dichroic film 34, and a first reflective film 71. A reflecting portion 72 of No. 1, a second reflecting film 35, and a third reflecting film 36 are provided. That is, the first reflecting portion 72 further includes a reflecting surface made of a metal material.

When viewed from a direction perpendicular to the reference plane P, the dichroic film 34 is provided in a region including the central region of the wavelength conversion layer 32, and the first reflective film 71 is provided outside the dichroic film 34. .. The first reflective film 71 is made of a metal material provided on the convex surface 33d of the translucent member 33. The convex surface 33d (support surface) of the translucent member 33 is hemispherical and includes a curved surface. It is desirable that a metal material having high light reflectance such as aluminum and silver is used for the first reflective film 71.
Other configurations are the same as those in the first embodiment.

The first reflective film 71 may have at least a portion provided outside the dichroic film 34, and may partially overlap the dichroic film 34.

The dichroic film 34 transmits the blue excitation light B emitted from the excitation light source 110 and reflects the yellow fluorescent light Y generated by the wavelength conversion layer 32. The first reflective film 71 reflects the yellow fluorescent light Y generated by the wavelength conversion layer 32. That is, among the first reflecting portions 72, the dichroic film 34 has wavelength selectivity, and the first reflecting film 71 does not have wavelength selectivity.

When viewed from a direction perpendicular to the reference plane P, the shape of the formation region of the dichroic film 34 is not particularly limited, but it is desirable to match the shape of the irradiation region of the excitation light B. The size of the formation region of the dichroic film 34 is not particularly limited, but it is desirable that the dimensions are appropriately set according to the size of the irradiation region of the excitation light B. For example, it is desirable that the formation region of the dichroic film 34 is set to be slightly larger than the irradiation region of the excitation light B. As a result, even if the irradiation position of the excitation light B deviates slightly from the original position on the dichroic film 34, the loss of the excitation light B can be suppressed to a small value.

Also in the fourth embodiment, the first to third embodiments can provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The same effect as is obtained.

The dichroic film has a reflectance incident angle dependence, whereas the reflective surface made of a metal material does not have a reflectance incident angle dependence. Therefore, if the first reflecting portion 72 is composed of only the dichroic film, the fluorescent light passes through the dichroic film depending on the incident angle, so that the efficiency of extracting the fluorescent light from the light emitting end surface 32b is lowered. In that respect, in the wavelength conversion element 70 of the fourth embodiment, since the first reflection film 71 is provided outside the dichroic film 34, the wavelength conversion layer 32 is directed toward the region outside the dichroic film 34. The emitted fluorescent light Y2 is efficiently reflected by the reflecting surface 71r. As a result, the efficiency of extracting the fluorescent light Y2 from the light emitting end face 32b can be improved.

[Fifth Embodiment]
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projector and the light source device of the fifth embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 8 is a cross-sectional view of the wavelength conversion element of the fifth embodiment. FIG. 8 corresponds to FIG. 3 in the first embodiment.
In FIG. 8, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, the wavelength conversion element 80 of the fifth embodiment includes a base material 31, a wavelength conversion layer 32, a translucent member 33, a structure 81, a dichroic film 34, and a reflective surface 71r. The first reflecting portion 72 including the first reflecting portion 72, the second reflecting film 35, and the third reflecting film 36 are provided.

Similar to the fourth embodiment, when viewed from a direction perpendicular to the reference plane P, the dichroic film 34 is provided in a region including the central region of the wavelength conversion layer 32, and the reflecting surface 71r is outside the dichroic film 34. It is provided. Further, the wavelength conversion element 80 further includes a structure 81 that overlaps the reflection surface 71r when viewed from a direction perpendicular to the reference surface P.

The structure 81 is a plate-shaped member, and has, for example, a circular opening 81o in the central region when viewed from a direction perpendicular to the reference surface P. The thickness K1 of the structure 81 is smaller than the distance G1 between the reference plane P and the dichroic film 34 in the central region of the dichroic film 34. The translucent member 33 is fitted into the opening 81o of the structure 81, and the central region of the translucent member 33 is exposed from the opening 81o of the structure 81. The constituent material of the structure 81 is not particularly limited, but for example, an inorganic material or a metal material is used.

The convex surface 33d (support surface) is provided on the side of the translucent member 33 opposite to the light incident end surface 32a. Of the first reflecting portion 72, the dichroic film 34 is provided on the convex surface 33d of the translucent member 33. The reflective surface 71r is composed of a first reflective film 71 provided on the structure 81. The first reflective film 71 is provided on the end surface 81t of the structure 81 on the opening 81o side. The structure 81 is in contact with the translucent member 33 via the first reflective film 71.
Other configurations are the same as those in the fourth embodiment.

Also in the fifth embodiment, the first to fourth embodiments can provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The same effect as is obtained.

In the case of the fifth embodiment, the translucent member 33 and the structure 81 are thermally connected via the first reflective film 71. Therefore, the heat generated in the wavelength conversion layer 32 when the excitation light B is irradiated is released to the outside through the translucent member 33, the first reflective film 71, and the structure 81. In this way, heat dissipation of the wavelength conversion layer 32 is promoted, and the conversion efficiency of the wavelength conversion layer 32 can be improved. In order to promote heat dissipation of the wavelength conversion layer 32, it is desirable that the structure 81 is made of a material having high thermal conductivity.

In the case of the wavelength conversion element 70 of the fourth embodiment, the dichroic film 34 is provided on a part of the convex surface 33d of the translucent member 33, and the first reflective film 71 is provided on the other part of the convex surface 33d. .. Therefore, each of the dichroic film 34 and the first reflective film 71 must be selectively formed when the wavelength conversion element 70 is manufactured, and masking is required in the film forming process.

On the other hand, in the case of the fifth embodiment, the translucent member 33 is provided with the dichroic film 34, and the structure 81 is provided with the first reflective film 71. Therefore, for example, after forming the first reflective film 71 on the structure 81, the translucent member 33 is fitted into the opening 81o, and the dichroic film 34 is formed on the translucent member 33. Can be adopted. According to this film forming process, the structure 81 functions as a mask, and the dichroic film 34 is selectively formed in the central region exposed from the structure 81 among the translucent members 33. Therefore, masking is not required, and the film formation process can be simplified.

[Sixth Embodiment]
Hereinafter, the sixth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projector and the light source device of the sixth embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 9 is a cross-sectional view of the wavelength conversion element of the sixth embodiment. FIG. 9 corresponds to FIG. 3 in the first embodiment.
In FIG. 9, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the wavelength conversion element 80 of the fifth embodiment, the cross-sectional shape of the end face 81t on the opening 81o side of the structure 81 is curved in the cross section perpendicular to the reference plane P. On the other hand, as shown in FIG. 9, in the wavelength conversion element 90 of the sixth embodiment, the cross-sectional shape of the end face 91t on the opening 91o side of the structure 91 is linear in the cross section perpendicular to the reference plane P. is there. Therefore, in the cross section perpendicular to the reference surface P, the cross section of the region 92d1 in contact with the end surface 91t of the structure 91 is linear among the convex surfaces 92d, and the cross section of the region 92d2 exposed from the opening 91o of the structure 91. The shape is curved.
Other configurations are the same as those in the fifth embodiment.

Also in the sixth embodiment, the first to fifth embodiments can provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The same effect as is obtained. Further, also in the sixth embodiment, the same effect as in the fifth embodiment that the film forming process can be simplified can be obtained.

[7th Embodiment]
Hereinafter, the seventh embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projector and the light source device of the seventh embodiment is the same as that of the first embodiment, and the configuration of the wavelength conversion element is different from that of the first embodiment. Therefore, the description of the projector and the light source device as a whole will be omitted, and only the wavelength conversion element will be described.
FIG. 10 is a cross-sectional view of the wavelength conversion element of the seventh embodiment. FIG. 10 corresponds to FIG. 9 in the sixth embodiment.
In FIG. 10, the same components as those in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted.

In the wavelength conversion element 90 of the sixth embodiment, the convex surface 92d2 of the translucent member 92 exposed from the opening 91o of the structure 91 has a curved surface shape. On the other hand, as shown in FIG. 10, in the wavelength conversion element 95 of the seventh embodiment, the convex surface 96d (support surface) of the translucent member 96 has a flat surface 96d1 and an inclination described in the claims. It includes an inclined surface 96d2 corresponding to the portion. That is, the translucent member 96 of the seventh embodiment has a shape in which a portion of the translucent member 92 of the sixth embodiment exposed from the opening of the structure 91 is cut by a flat surface. As described above, the dichroic film 34 does not necessarily have to be provided on the inclined portion, and may be provided on the flat surface 96d1.
Other configurations are the same as those in the sixth embodiment.

Also in the seventh embodiment, the first to sixth embodiments can provide a wavelength conversion element in which the proportion of the component of the fluorescent light Y that can be extracted from the light emitting end surface 32b of the wavelength conversion layer 32 in a desired direction is larger than that of the conventional one. The same effect as is obtained. Further, also in the seventh embodiment, the same effect as in the fifth embodiment that the film forming process can be simplified can be obtained.

In the fifth to seventh embodiments, in order to simplify the film forming process, an example in which the dichroic film 34 is provided on the translucent member and the first reflective film 71 is provided on the structure is given. It was. However, if simplification of the film forming process is not required, both the dichroic film 34 and the first reflective film 71 may be provided on the translucent member as in the fourth embodiment. Even in that case, if the translucent member and the structure are thermally connected via the first reflective film 71, the effect of enhancing the heat dissipation effect can be obtained. Further, the translucent member and the structure do not necessarily have to be in contact with each other, and an air layer may be provided between the translucent member and the structure.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, as the translucent member, a plano-convex lens was used in the first embodiment, and a convex meniscus lens was used in the second embodiment. In addition to these plano-convex lenses and convex meniscus lenses, for example, a plano-concave lens and a concave meniscus lens were used. May be good. Further, as in the third embodiment and the seventh embodiment, a translucent member having a shape other than the lens may be used.

In the above embodiment, the example in which the translucent member is in contact with the base material is shown, but the translucent member may be arranged away from the base material. In that case, the translucent member may be supported by an arbitrary support portion. Further, in the first to sixth embodiments, an example is shown in which the translucent member has a curved surface at least partially and a dichroic film is provided on the curved surface, but the translucent member does not necessarily have a curved surface. You don't have to. For example, the translucent member may have a plane (inclined portion) inclined with respect to the reference plane P including the light incident end surface of the wavelength conversion layer, and a dichroic film may be provided on the plane. Further, in the wavelength conversion element of the present invention, the base material is not essential, and the base material may not be present. For example, when the translucent member is composed of a plano-convex lens, the wavelength conversion layer may be supported by the flat surface of the plano-convex lens. Further, a dichroic film that reflects the excitation light B and transmits the fluorescent light Y may be provided on the light emitting end surface 32b of the wavelength conversion layer 32.

In addition, the number, shape, material, arrangement, etc. of each component constituting the wavelength conversion element and the light source device can be changed as appropriate. Further, in the above embodiment, a projector including three light modulation devices is illustrated, but the present invention can also be applied to a projector that displays a color image with one light modulation device. Further, the optical modulation device is not limited to the liquid crystal panel described above, and for example, a digital mirror device or the like can be used.

In addition, the shape, number, arrangement, materials, and the like of various components of the projector are not limited to the above-described embodiment, and can be appropriately changed.
Further, in the above embodiment, an example in which the light source device according to the present invention is mounted on the projector is shown, but the present invention is not limited to this. The light source device according to the present invention can also be applied to lighting equipment, automobile headlights, and the like.

1 ... Projector, 2 ... Light source device, 4R, 4G, 4B ... Light modulator, 6 ... Projection optical system, 20 ... Condensing optical system, 30, 40, 50, 70, 80, 90, 95 ... Wavelength conversion element, 31 ... base material, 31a ... first surface, 31b ... second surface, 31h ... hole, 32 ... wavelength conversion layer, 32a ... light incident end surface, 33, 41, 51, 92, 97 ... translucent member, 33d, 92d1, 92d2 ... Convex surface (support surface), 34 ... Dycroic film, 35 ... Second reflective film (second reflective portion), 36 ... Third reflective film (third reflective portion), 42 ... Air Layer, 71 ... first reflective film, 71r ... reflective surface, 72 ... first reflective portion, 81, 96 ... structure.

Claims (13)

A wavelength conversion layer having a light incident end face and
A translucent member provided on the light incident end surface side of the wavelength conversion layer and having a support surface including an inclined portion inclined with respect to the light incident end surface.
A first reflecting portion provided along the support surface and reflecting fluorescent light emitted from the wavelength conversion layer, and a first reflecting portion.
A base material having a first surface, a second surface facing the first surface, and a hole penetrating between the first surface and the second surface.
A second reflecting unit that reflects the fluorescent light generated by the wavelength conversion layer, and
With
The wavelength conversion layer is provided inside the pores of the base material.
The second reflecting portion is provided between the base material and the wavelength conversion layer on the inner peripheral surface of the hole.
At least a part of the first reflecting portion is composed of a dichroic film that transmits excitation light for exciting the wavelength conversion layer.
The translucent member is arranged so that the excitation light passes through the dichroic film and the light incident end face in this order and is incident on the wavelength conversion layer.
When the plane including the light incident end surface is used as the reference plane and the distance between the reference plane and the first reflecting portion in the direction perpendicular to the reference plane is defined as the distance between the reference plane and the first reflecting portion. In the inclined portion, the distance between the reference surface and the first reflection portion in the peripheral region of the first reflection portion is the distance between the reference plane and the first reflection in the central region of the first reflection portion. It is inclined with respect to the light incident end face so as to be smaller than the distance to the portion .
When viewed from a direction perpendicular to the plane, the contour of the light incident end face is located inside the contour of the dichroic film, and of the fluorescent light, it is reflected by the dichroic film and is outside the light incident end face. Further provided with a third reflecting portion that reflects the component traveling toward the region of the dichroic film toward the dichroic film.
The translucent member is provided on the first surface side of the base material.
The third reflecting portion is a wavelength conversion element provided between the first surface of the base material and the translucent member . The wavelength conversion element according to claim 1, wherein an air layer is provided between the translucent member and the light incident end face. The wavelength conversion element according to claim 1 or 2, wherein the support surface includes a flat surface. The wavelength conversion element according to claim 1 or 2, wherein the support surface includes a curved surface. The translucent member is a plano-convex lens.
The flat surface of the plano-convex lens faces the light incident end surface.
The wavelength conversion element according to claim 1, wherein the flat surface is in thermal contact with the light incident end surface. The wavelength conversion element according to claim 5, wherein the refractive index of the translucent member is equal to the refractive index of the phosphor constituting the wavelength conversion layer. The first reflective portion further includes a reflective surface made of a metal material.
When viewed from a direction perpendicular to the light incident end surface, the dichroic film is provided in a region including the central region of the wavelength conversion layer, and the reflective surface is provided at least outside the dichroic film. , The wavelength conversion element according to any one of claims 1 to 6. Further provided with a structure that overlaps the reflecting surface when viewed from a direction perpendicular to the light incident end surface.
The support surface is provided on the surface of the translucent member opposite to the surface of the wavelength conversion layer on which the light incident end surface is provided.
The wavelength conversion element according to claim 7, wherein the reflecting surface is provided on the structure. The wavelength conversion element according to claim 8, wherein the reflective surface is composed of a reflective film provided on the structure. Any one of claims 1 to 4, wherein the support surface is provided on the surface of the wavelength conversion layer on the side where the light incident end surface is provided, among the surfaces of the translucent member. The wavelength conversion element according to. The wavelength conversion element according to any one of claims 1 to 10 .
A light source device including an excitation light source that emits the excitation light. With a condensing optical system
The translucent member is provided on the first surface side of the base material.
The light source device according to claim 11 , wherein the condensing optical system is provided on the second surface side of the base material. The light source device according to claim 11 or 12 .
An optical modulation device that generates image light by modulating the light emitted from the light source device according to image information.
A projector including a projection optical system for projecting the image light.

Images