JP2017130328A - Wavelength conversion device, illumination device, and projector - Google Patents

Abstract

A wavelength conversion device capable of suppressing damage to a wavelength conversion element is provided.
A wavelength conversion device 30 of the present invention includes a base material 40, a wavelength conversion element 42 made of an inorganic material provided on the base material 40, and a thermosetting that fixes the wavelength conversion element 42 to the base material 40. The fixing member 37 and a rotating device that rotates the base material 40 are provided. The fixing member 37 is disposed to the outside of the outer diameter of the wavelength conversion element 42 with the rotation center axis of the substrate 40 as a reference.
[Selection] Figure 3

Description

  The present invention relates to a wavelength conversion device, an illumination device, and a projector.

  In recent years, an illumination device using a rotating fluorescent plate has been proposed as an illumination device for a projector. The rotating fluorescent plate generates illumination light including fluorescence by rotating the substrate on which the phosphor layer is provided and irradiating the phosphor layer on the substrate with excitation light to generate fluorescence.

  Patent Document 1 below discloses a light source device including a light source and a light emitting wheel disposed on the optical axis of the light source. The light emitting wheel includes a fluorescent light emitting region and a diffuse transmission region. In the fluorescence emission region, a phosphor layer that emits light from the light source as excitation light is provided. The phosphor layer has a configuration in which the phosphor is dispersed in a binder such as silicone resin or glass, and is fixed to the substrate with an adhesive.

JP 2010-256457 A

  In the manufacturing process of the light emitting wheel having the above configuration, for example, when the inorganic phosphor layer is fixed to the base material using a thermosetting adhesive, the inorganic phosphor layer is cracked, the inorganic phosphor layer is cracked, etc. The phosphor layer may be damaged.

  One aspect of the present invention is made to solve the above-described problems, and an object of the present invention is to provide a wavelength conversion device that can suppress damage to the inorganic wavelength conversion element. An object of one embodiment of the present invention is to provide a highly reliable lighting device by including the above-described wavelength conversion device. An object of one embodiment of the present invention is to provide a highly reliable projector by including the above-described lighting device.

  In order to achieve the above object, a wavelength conversion device according to one aspect of the present invention includes a base material, a wavelength conversion element made of an inorganic material provided on one surface of the base material, and the wavelength conversion element based on the base material. A thermosetting fixing member that is fixed to a material, and a rotating device that rotates the base material, wherein the fixing member is based on a rotation center axis of the base material and is larger than an outer diameter of the wavelength conversion element. It is arranged to the outside.

  In the wavelength conversion device according to one aspect of the present invention, since the fixing member is disposed outside the outer diameter of the wavelength conversion element with respect to the rotation center axis of the substrate, the substrate is rotated at the rotation center axis in the manufacturing process. Even when the fixing member moves toward the rotation center axis side as the heat shrinks toward the center, stress concentration in the vicinity of the outer end of the wavelength conversion element can be suppressed. Thereby, damage to the wavelength conversion element can be suppressed.

In the wavelength conversion device according to one aspect of the present invention, the thickness of a portion of the fixing member that is disposed outside the outer diameter of the wavelength conversion element is equal to or greater than the thickness of the wavelength conversion element. Also good.
According to this configuration, it is possible to more effectively suppress damage to the wavelength conversion element.

In the wavelength conversion device according to one aspect of the present invention, the wavelength conversion element has an annular shape when viewed from the normal direction of the base material, and the fixing member is based on the rotation center axis of the base material. As above, it may be arranged to the inner side of the inner diameter of the wavelength conversion element.
According to this configuration, it is possible to more effectively suppress damage to the wavelength conversion element.

In the wavelength conversion device according to one aspect of the present invention, the thickness of a portion of the fixing member that is disposed to the inner side of the inner diameter of the wavelength conversion element may be equal to or greater than the thickness of the wavelength conversion element. Good.
According to this configuration, it is possible to more effectively suppress damage to the wavelength conversion element.

An illumination device according to one aspect of the present invention includes the wavelength conversion device according to one aspect of the present invention and a light source that emits excitation light that excites the inorganic wavelength conversion element.
Since the lighting device of one embodiment of the present invention includes the wavelength conversion device of one embodiment of the present invention, a highly reliable lighting device can be provided.

A projector according to an aspect of the present invention includes a lighting device according to one aspect of the present invention, a light modulation device that modulates light emitted from the lighting device in accordance with image information, and the light modulation device. A projection optical system for projecting light.
Since the projector according to one embodiment of the present invention includes the lighting device according to one embodiment of the present invention, a highly reliable projector can be provided.

It is a schematic block diagram of the projector of one Embodiment of this invention. It is a perspective view of a wavelength converter. FIG. 3 is a cross-sectional view taken along line A-A ′ of FIG. 2. It is a graph which shows the relationship between the position of the width direction of a wavelength conversion element, and the largest principal stress. (A), (B) It is a figure for demonstrating the problem of the conventional wavelength converter.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS.
In the following drawings, in order to make each component easy to see, the scale of the size may be varied depending on the component.

An example of the projector according to the present embodiment will be described.
The projector according to the present embodiment is a projection type image display device that displays a color image on a screen (projected surface). The projector includes three liquid crystal light modulation devices corresponding to red, green, and blue light. The projector includes a semiconductor laser that can obtain light with high luminance and high output as a light source of the lighting device.

FIG. 1 is a schematic diagram showing an optical system of a projector 1 according to this embodiment.
As shown in FIG. 1, the projector 1 includes a first illumination device 100, a second illumination device 102, a color separation light guide optical system 200, a liquid crystal light modulation device 400R, a liquid crystal light modulation device 400G, and liquid crystal light. A modulation device 400B, a cross dichroic prism 500, and a projection optical system 600 are provided.
The 1st lighting device 100 of this embodiment respond | corresponds to the lighting device of a claim.

  The first lighting device 100 includes a first light source 10, a collimating optical system 70, a dichroic mirror 80, a collimating condensing optical system 90, a wavelength conversion device 30, a first lens array 120, and a second lens array 130. And a polarization conversion element 140 and a superimposing lens 150.

The first light source 10 includes a semiconductor laser that emits blue laser light (emission intensity peak: about 445 nm) E in the first wavelength band as excitation light. The first light source 10 may be composed of one semiconductor laser or may be composed of a plurality of semiconductor lasers.
The first light source 10 may be a semiconductor laser that emits blue laser light having a wavelength other than 445 nm, for example, 460 nm.
The 1st light source 10 of this embodiment respond | corresponds to the light source of a claim.

The first light source 10 is arranged so that the optical axis 200ax of the laser light emitted from the first light source 10 is orthogonal to the illumination optical axis 100ax.
The collimating optical system 70 includes a first lens 72 and a second lens 74. The collimating optical system 70 makes the light emitted from the first light source 10 substantially parallel. The 1st lens 72 and the 2nd lens 74 are comprised by the convex lens.

  The dichroic mirror 80 is disposed in the optical path from the collimating optical system 70 to the collimating condensing optical system 90 so as to intersect with each of the optical axis 200ax of the first light source 10 and the illumination optical axis 100ax at an angle of 45 °. Has been. The dichroic mirror 80 reflects blue light E and transmits yellow fluorescence Y including red light and green light.

  The collimator condensing optical system 90 condenses the blue light E that has passed through the dichroic mirror 80 and makes it incident on the wavelength conversion element 42 of the wavelength conversion device 30, and substantially parallelizes the fluorescence emitted from the wavelength conversion element 42. And a function to perform. The collimator condensing optical system 90 includes a first lens 92 and a second lens 94. The 1st lens 92 and the 2nd lens 94 are comprised by the convex lens.

  The second illumination device 102 includes a second light source 710, a condensing optical system 760, a scattering plate 732, and a collimating optical system 770.

The second light source 710 is composed of the same semiconductor laser as the first light source 10 of the first lighting device 100. The second light source 710 may be composed of one semiconductor laser or may be composed of a plurality of semiconductor lasers.
The condensing optical system 760 includes a first lens 762 and a second lens 764. The condensing optical system 760 condenses the blue light B emitted from the second light source 710 on the scattering plate 732 or in the vicinity of the scattering plate 732. The 1st lens 762 and the 2nd lens 764 are comprised by the convex lens.

  The scattering plate 732 scatters the blue light B emitted from the second light source 710 to generate blue light B having a light distribution close to the light distribution of the fluorescence Y emitted from the wavelength conversion device 30. As the scattering plate 732, for example, polished glass made of optical glass can be used.

  The collimating optical system 770 includes a first lens 772 and a second lens 774. The collimating optical system 770 substantially parallelizes the light emitted from the scattering plate 732. The first lens 772 and the second lens 774 are composed of convex lenses.

  The blue light B emitted from the second illumination device 102 is reflected by the dichroic mirror 80. The blue light B reflected by the dichroic mirror 80 is combined with the yellow fluorescent light Y that has passed through the dichroic mirror 80 after being emitted from the wavelength conversion device 30 and becomes white illumination light W. The illumination light W is incident on the first lens array 120.

FIG. 2 is a perspective view showing the wavelength conversion device 30. 3 is a cross-sectional view taken along line AA ′ of FIG.
As illustrated in FIGS. 1 to 3, the wavelength conversion device 30 includes a base material 40, a reflective film 41, a wavelength conversion element 42, a fixing member 37, and a motor 50. The wavelength conversion device 30 emits the fluorescence Y toward the same side as the side on which the blue light E is incident. That is, the wavelength conversion device 30 of the present embodiment is configured by a reflective rotary fluorescent plate. The motor 50 rotates the substrate 40.
The motor 50 of the present embodiment corresponds to the rotating device in the claims.

  The base material 40 is comprised from the metal base materials excellent in heat dissipation, such as aluminum and copper, for example. The substrate 40 is rotatable around the rotation center axis 35 by the operation of the motor 50. The base material 40 is a plate having a circular planar shape, for example, a diameter is set to about 50 mm to 60 mm, and a thickness is set to about 1 mm to 2 mm. However, the material, shape, and dimensions of the base material 40 are not limited to these.

  The wavelength conversion element 42 is made of an inorganic phosphor material having a circular planar shape when viewed from the normal direction of the substrate 40. The wavelength conversion element 42 is provided around the rotation center axis 35 on the one surface 40 a side of the base material 40. As shown in FIG. 3, the wavelength conversion element 42 includes a first surface 42a (the lower surface in FIG. 3) facing the one surface 40a of the substrate 40, and a second surface 42b opposite to the first surface 42a (FIG. 3). An upper surface), a first side surface 42c (right side surface in FIG. 3) in contact with the first surface 42a and the second surface 42b, a second side surface 42d (left side surface in FIG. 3) facing the first side surface 42c, Have The first side surface 42 c is a side surface constituting the outer periphery of the wavelength conversion element 42. The second side surface 42d is a side surface constituting the inner periphery of the wavelength conversion element 42.

  The outer diameter of the wavelength conversion element 42 is set smaller than the outer diameter of the substrate 40. The wavelength conversion element 42 is excited by the blue light E emitted from the first light source 10 and emits fluorescence Y in the second wavelength band. The fluorescence Y is yellow light including red light and green light.

The wavelength conversion element 42 includes, for example, an yttrium aluminum garnet (YAG) phosphor. Taking YAG: Ce as an example, as the wavelength conversion element 42, a material obtained by mixing a raw material powder containing constituent elements such as Y ₂ O ₃ , Al ₂ O ₃ , CeO ₃ and performing a solid phase reaction, a coprecipitation method, Y-Al-O amorphous particles obtained by a wet method such as a sol-gel method, YAG particles obtained by a vapor phase method such as a spray drying method, a flame pyrolysis method, or a thermal plasma method can be used. The wavelength conversion element 42 may be composed of a bulk phosphor, or may be configured such that the above phosphor is dispersed in a binder.

  The reflective film 41 is provided between the wavelength conversion element 42 and the base material 40. The reflective film 41 is designed to reflect the fluorescence Y with high efficiency. Therefore, the one surface 40a on which the reflective film 41 of the base material 40 is formed has a highly accurate planar roughness. Thereby, the reflective film 41 reflects most of the fluorescence Y toward the base material 40 toward the upward direction in FIG. 1 (the side opposite to the base material 40). In addition, when the one surface 40a of the base material 40 functions as a reflective surface, the reflective film 41 is not necessarily provided.

  Since the blue light E made of laser light is incident on the wavelength conversion element 42, heat is generated in the wavelength conversion element 42. In this embodiment, the incident position of the blue light E in the wavelength conversion element 42 is changed temporally by rotating the base material 40. Thereby, the blue light B is always irradiated to the same part of the wavelength conversion element 42, and it is suppressed that the wavelength conversion element 42 is heated locally and deteriorates.

  As shown in FIG. 3, the wavelength conversion element 42 is fixed to the base material 40 by a fixing member 37. In the present embodiment, a thermosetting adhesive is used as the fixing member 37. As the adhesive, it is desirable to use an adhesive having a low Young's modulus. In the case of the present embodiment, the reflective film 41 is provided on the one surface 40a of the base material 40, and the fixing member 37 needs to have light transmittance in order for the excitation light and the fluorescence to enter the reflective film 41. On the other hand, when the reflective film 41 is provided on the first surface 42 a of the wavelength conversion element 42, the fixing member 37 does not necessarily have light transmittance. As the fixing member 37, for example, a silicone resin adhesive can be used.

The fixing member 37 is disposed to the outside of the outer diameter (first side surface 42 c) of the wavelength conversion element 42 with the rotation center axis 35 of the substrate 40 as a reference. Further, the fixing member 37 is disposed to the inner side of the inner diameter (second side surface 42 d) of the wavelength conversion element 42 with the rotation center axis 35 of the substrate 40 as a reference. That is, the central portion of the fixing member 37 is located between the wavelength conversion element 42 and the base material 40, and both end portions of the fixing member 37 protrude from the outer peripheral side and the inner peripheral side of the wavelength conversion element 42.
Hereinafter, a portion of the fixing member 37 that is disposed outside the outside diameter of the wavelength conversion element 42 is referred to as an outside protrusion 37a, and a portion that is disposed inside the inside diameter of the wavelength conversion element 42 is projected outside. This is referred to as a part 37b.

  The thickness T1 of the protruding portion 37a of the fixing member 37 is equal to or greater than the thickness T2 of the wavelength conversion element 42. Further, the thickness T3 of the protruding portion 37b inside the fixing member 37 is equal to or greater than the thickness T2 of the wavelength conversion element 42. The thickness T1 of the outer protruding portion 37a and the thickness T3 of the inner protruding portion 37b may be the same or different. The outer protruding portion 37a goes from the first surface 42a of the wavelength conversion element 42 to the first side surface 42c side and is in contact with the first side surface 42c. The inner protruding portion 37b goes from the first surface 42a of the wavelength conversion element 42 to the second side surface 42d side and is in contact with the second side surface 42d.

  As shown in FIG. 1, the first lens array 120 includes a plurality of first small lenses 122 for dividing the light from the dichroic mirror 80 into a plurality of partial light beams. The plurality of first small 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 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 superimposing lens 150 in the subsequent stage, converts the images of the first small lenses 122 of the first lens array 120 into the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B, respectively. An image is formed near the image forming area. 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 light beam divided by the first lens array 120 into linearly polarized light having a uniform polarization direction.

  The superimposing lens 150 condenses the partial light beams emitted from the polarization conversion element 140 and superimposes them on the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B in the vicinity of each image forming region. . The first lens array 120, the second lens array 130, and the superimposing lens 150 constitute an integrator optical system that makes the in-plane light intensity distribution of the light from the wavelength conversion device 30 uniform.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, and relay lenses 260 and 270. The color separation light guide optical system 200 separates the white light W obtained from the first lighting device 100 and the second lighting device 102 into red light R, green light G, and blue light B, and red light R, green light. The light G and the blue light B are guided to the corresponding liquid crystal light modulation devices 400R, 400G, 400B. The field lenses 300R, 300G, and 300B are respectively disposed between the color separation light guide optical system 200 and the liquid crystal light modulation devices 400R, 400G, and 400B.

  The dichroic mirror 210 is a dichroic mirror that transmits a red light component 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 transmits a blue light component. 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 blue light components.

  The red light that has passed through the dichroic mirror 210 is reflected by the reflecting mirror 230, passes through the field lens 300R, and enters the image forming region of the liquid crystal light modulation device 400R for red light. The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, passes through the field lens 300G, and enters the image forming area of the liquid crystal light modulation device 400G for green light. The blue light that has passed through the dichroic mirror 220 passes through the relay lens 260, the incident-side reflection mirror 240, the relay lens 270, the emission-side reflection mirror 250, and the field lens 300B, thereby forming an image of the liquid crystal light modulation device 400B for blue light. Incident into the area.

  The liquid crystal light modulation devices 400R, 400G, and 400B modulate incident color light according to image information, and form color images corresponding to the respective color lights. Although not shown, an incident-side polarizing plate is disposed on the light incident side of the liquid crystal light modulation devices 400R, 400G, and 400B. An exit side polarizing plate is disposed on the light exit side of the liquid crystal light modulation devices 400R, 400G, and 400B.

  The cross dichroic prism 500 synthesizes the image lights emitted from the liquid crystal light modulation devices 400R, 400G, and 400B to form a color image. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR. The projection optical system 600 includes a plurality of projection lenses 6.

As a result of earnestly examining the cause of damage of the wavelength conversion element (phosphor layer) in the conventional wavelength conversion device, the present inventor has obtained the following knowledge.
For example, when fixing a wavelength conversion element to a base material using a thermosetting fixing member (adhesive), the temperature is high until the fixing member is completely cured after the wavelength conversion element is placed on the base material. A step of leaving in a state for a certain time is required.

Here, a case is considered in which a wavelength conversion element made of an inorganic material is fixed to a metal substrate using a thermosetting fixing member.
In the case of the conventional wavelength conversion device 1001, as shown in FIG. 5A, the fixing member (adhesive) 1002 is formed on the substrate 1004 so that the width of the fixing member 1002 matches the width of the wavelength conversion element 1003. Was provided. In this case, when the temperature is lowered in the curing step of the fixing member 1002, as shown in FIG. 5B, the annular wavelength conversion element 1003 contracts toward the rotation center axis side (indicated by the arrow S1). The base material 1004 having a thermal contraction rate larger than that of the wavelength conversion element 1003 contracts more toward the rotation center axis side (indicated by the arrow S2).

  At this time, the curing shrinkage rate of the thermosetting fixing member 1002 itself is smaller than the thermal shrinkage rate of the substrate 1004. Therefore, the fixing member 1002 follows the contraction of the base material 1004 and flows toward the rotation center axis, and the outer peripheral end of the fixing member 1002 moves to the inside of the outer periphery of the wavelength conversion element 1003. As a result, it was found that stress was concentrated in the vicinity of the outer end portion of the wavelength conversion element 1003 (position indicated by point P), and the stress concentration point was a starting point for damage such as cracks and cracks.

  On the other hand, in the wavelength conversion device 30 of the present embodiment, since the fixing member 37 is disposed to the outside of the outer diameter of the wavelength conversion element 42, the base material 40 contracts toward the rotation center axis 35 side. Accordingly, even if the fixing member 37 flows toward the rotation center shaft 35, the outer peripheral side end of the fixing member 37 is less likely to enter the outer periphery of the wavelength conversion element 42, and the outside of the wavelength conversion element 42. Concentration of stress in the vicinity of the end can be suppressed. Furthermore, since the fixing member 37 is disposed to the inner side of the inner diameter of the wavelength conversion element 42, the fixing member 37 easily flows smoothly toward the rotation center shaft 35, and stress concentration can be further suppressed.

  In the present embodiment, the thickness T1 of the outer protruding portion 37a and the thickness T3 of the inner protruding portion 37b of the fixing member 37 are set to be equal to or greater than the thickness T2 of the wavelength conversion element 42. The volume of the part is sufficiently secured. For this reason, the outer peripheral side end of the fixing member 37 is less likely to enter the inner periphery of the wavelength conversion element 42. As described above, damage to the wavelength conversion element 42 can be suppressed.

The inventor calculated the magnitude of the stress generated in the wavelength conversion element by simulation for the wavelength conversion device of the example and the conventional wavelength conversion device.
As simulation conditions, the material of the wavelength conversion element was a YAG bulk phosphor, and the width of the wavelength conversion element was 6 mm. The base material was aluminum. Further, a thermosetting silicone adhesive was used for the fixing member. In the conventional wavelength conversion device, the width of the fixing member was set to 6 mm, which was matched with the width of the wavelength conversion element. The wavelength conversion device of the example was configured such that the width of the fixing member was 7 mm, and the fixing member protruded by 0.5 mm on each of the outer diameter side and the inner diameter side of the wavelength conversion element.

  The simulation results are shown in FIG. The horizontal axis in FIG. 4 indicates the position [mm] in the width direction of the wavelength conversion element (phosphor layer), and the vertical axis in FIG. 4 indicates the maximum principal stress [MPa]. The position in the width direction of the wavelength conversion element is indicated by the distance from the inner peripheral end of the wavelength conversion element. That is, the inner peripheral end of the wavelength conversion element is 0 mm, and the outer peripheral end of the wavelength conversion element is 6 mm.

  As shown by a solid line in FIG. 4, in the case of the wavelength conversion device of the conventional example, the maximum principal stress has a peak in the vicinity of the position of the wavelength conversion element of 5.3 mm, which is about 4 MPa. On the other hand, as shown by a broken line in FIG. 4, in the case of the wavelength conversion device of the example, the maximum principal stress has a peak at a position where the wavelength conversion element is near 5.7 mm, and is about 1 MPa. As described above, in the wavelength conversion device of the embodiment, the fixing member protrudes to the outer diameter side and the inner diameter side of the wavelength conversion element, thereby reducing the stress inside the wavelength conversion element to about ¼ of the conventional one. I found that I can do it.

As described above, according to the present embodiment, the following effects can be obtained.
Since the first lighting device 100 of the present embodiment includes the wavelength conversion device 30 having the above-described configuration, a highly reliable lighting device can be realized. In addition, since the projector 1 according to the present embodiment includes the first lighting device 100 having the above-described configuration, a highly reliable projector can be realized.

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, in the above embodiment, the fixing member is arranged on both the outer side of the outer diameter of the wavelength conversion element and the inner side of the inner diameter of the wavelength conversion element. However, the fixing member is at least the outer diameter of the wavelength conversion element. What is necessary is just to arrange | position outside.

  In the above embodiment, an example of an illuminating device that synthesizes yellow fluorescent light emitted from the wavelength conversion device and blue light emitted from the second illuminating device to generate white is given, but instead of this configuration, It is good also as an illuminating device which synthesize | combines the blue excitation light and yellow fluorescence which were not wavelength-converted in the wavelength conversion element, and produces | generates white. Moreover, although the example of the wavelength converter provided with the reflection type wavelength conversion element was given, the wavelength converter provided with the transmission type wavelength conversion element may be used. In this case, the reflective layer on the base material is unnecessary, and both the base material and the fixing member need to have light transmittance.

  In addition, the specific description of the shape, number, arrangement, material, and the like of each component of the wavelength conversion device, the illumination device, and the projector is not limited to the above embodiment, and can be changed as appropriate. In the said embodiment, although the example which mounted the illuminating device by this invention in the projector using a liquid crystal light modulation apparatus was shown, it is not restricted to this. You may mount in the projector using a digital micromirror device as a light modulation apparatus.

  In the said embodiment, although the example which mounted the illuminating device by this invention in the projector was shown, it is not restricted to this. The lighting device according to the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

  In the said embodiment, although the fluorescent substance layer was used as a wavelength conversion element, it is not restricted to this. For example, a quantum rod or the like may be used as the wavelength conversion element.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... 1st light source (light source), 30 ... Wavelength converter, 35 ... Rotation center axis, 37 ... Adhering member, 40 ... Base material, 42 ... Wavelength conversion element, 50 ... Motor (rotation device), 100 ... 1st illumination device (illumination device), 400R, 400G, 400B ... Liquid crystal light modulation device (light modulation device), 600 ... Projection optical system.

Claims (6)

A substrate;
A wavelength conversion element made of an inorganic material provided on one surface of the substrate;
A thermosetting fixing member for fixing the wavelength conversion element to the substrate;
A rotating device for rotating the base material,
The wavelength conversion device, wherein the fixing member is disposed to the outside of the outer diameter of the wavelength conversion element with reference to the rotation center axis of the base material.   2. The wavelength conversion device according to claim 1, wherein a thickness of a portion of the fixing member that is disposed outside an outer diameter of the wavelength conversion element is equal to or greater than a thickness of the wavelength conversion element. The wavelength conversion element has an annular shape when viewed from the normal direction of the substrate,
3. The wavelength conversion device according to claim 1, wherein the fixing member is disposed to an inner side than an inner diameter of the wavelength conversion element with reference to a rotation center axis of the base material.   4. The wavelength conversion device according to claim 3, wherein a thickness of a portion of the fixing member disposed to an inner side of an inner diameter of the wavelength conversion element is equal to or greater than a thickness of the wavelength conversion element. The wavelength converter according to any one of claims 1 to 4,
And a light source that emits excitation light that excites the wavelength conversion element. A lighting device according to claim 5;
A light modulation device that modulates light emitted from the illumination device according to image information;
And a projection optical system that projects the light modulated by the light modulation device.

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