JP2019082674A - Lighting unit and projection type video display device - Google Patents

Abstract

To provide a lighting unit that obtains white by using a stationary phosphor with a simple configuration, and a projection type video display device using the same.SOLUTION: A phosphor device 110 has phosphor pieces 111a, 111b, 111c, 111d, 111e, 111f and reflection layers provided on their rear faces fixed, with an adhesion layer, to a spreader 115 made of a material, such as copper excellent in thermal conductivity. Reflection areas 117a, 117b are provided between the phosphor pieces 111a, 111b, 111c, 111d, 111e, 111f. A reflection surface of the reflection area is provided in a zigzag shape or a concavo-convex shape, and is configured such that incident light is regularly reflected on the reflection surface with a certain diffusion width. The reflection surface is formed on a reference spherical surface that spreads and reflects incident light from a front face. In this way, reflection light is reflected with a spread despite its regular reflection.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a lighting device using a phosphor and a projection type video display using the same as a light source.

  Although Patent Document 1 discloses that between divided phosphors is shielded by a light absorbing material and the directionality of light emission is set as a control specification, the heat generation of the light absorbing material is assumed assuming the light emission intensity assumed for lighting etc. Is remarkable and is not realistic because of the temperature quenching characteristics of the phosphor. Patent Document 2 discloses a technique in which a more active wall is provided at the interface between the phosphors, and the wall is configured as a metal reflective surface. This also has a feature at the interface between adjacent phosphors. In addition, the presence of metals having different thermal expansions at the interface leads to instability in reliability.

  In either case, different materials intervene between the phosphors, and the excitation light incident thereon is wasted, which is accompanied by a clear efficiency drop.

JP 2012-129135 A JP, 2013-102078, A

  The present disclosure can provide a synthetic color obtained by combining the color light of the excitation light and the fluorescence light with a simple configuration, and at the same time, by dividing the phosphor into a plurality of phosphor pieces, when receiving strong excitation energy. Provides a highly reliable lighting device which does not cause peeling failure.

  The illumination device in the present disclosure includes an excitation light source for emitting polarized light, a phosphor for emitting fluorescence by receiving the light from the excitation light source as excitation light, a spreader made of a material having excellent thermal conductivity, and a phosphor And a spreader, and a reflective layer having a property of reflecting light of a wavelength of fluorescence. In the phosphor, a plurality of phosphor pieces having the same characteristics are disposed adjacent to each other on the spreader, and between the phosphor pieces is provided a reflection area having a reflection surface that reflects while maintaining the polarization characteristic of excitation light. .

  According to the illumination device in the present disclosure, a composite color (for example, white) obtained by combining the color light of the excitation light and the fluorescence light can be provided with a simple configuration, and the phosphor is divided into a plurality of phosphor pieces. It is possible to realize high reliability that does not cause peeling failure even when receiving strong excitation energy.

The figure which shows the projection type image display apparatus using the fluorescent substance light source illuminating device which concerns on embodiment Diagram showing spectral characteristics of dichroic mirror Front view of phosphor device used for phosphor light source lighting device Side view of the phosphor device shown in FIG. 3 Diagram showing the configuration of the reflection area of the phosphor device The figure which shows the modification 1 of the reflective area of a phosphor apparatus The figure which shows the modification 2 of the reflective area of a phosphor apparatus Front view of phosphor device according to modification 3 Side view of the phosphor device shown in FIG.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, the detailed description may be omitted if necessary. For example, detailed description of already well-known matters and redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

  It should be noted that the attached drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and they are not intended to limit the claimed subject matter.

Embodiment
Hereinafter, an embodiment of a phosphor light source illumination device will be described using FIGS. 1 to 9.

  FIG. 1 is a view showing the configuration of a projection type video display using a fluorescent light source illumination device, and FIG. 2 is a spectral characteristic view of a dichroic mirror. 3 is a front view of a phosphor device used for a phosphor light source illumination device, FIG. 4 is a side view of the phosphor device of FIG. 3, FIG. 5 is an enlarged view of a part of arrow A of the phosphor device of FIG. 7 is a partial enlarged view showing the configuration of the reflection area of the phosphor device according to the first and second modifications, FIG. 8 is a front view of the phosphor device according to the third modification, and FIG. 9 is the phosphor device of FIG. Side view of FIG. It should be noted that hatching in the drawings of FIGS. 3 to 9 is given to understand the configuration, and does not indicate a cross section.

  In FIG. 1, the blue laser diode unit 101 for the light source is composed of a plurality of blue laser diodes and a collimating lens disposed corresponding to the respective blue laser diodes on the emission surface side thereof to suppress the spread of the laser light Light can be output. The light emitted from the blue laser diode unit 101 is emitted in the + X direction, and is made approximately telecentric light (parallel light) by the lens 102 and the lens 103 and enters the diffusion plate 104. That is, the lens 102 and the lens 103 constitute an afocal optical system. The diffusion plate 104 is provided with innumerable minute projections on its surface, and the emission angle after transmission of incident light can be controlled in the Y direction in FIG. 1 and in the direction perpendicular to the paper surface. Here, the light incident on the diffusion plate 104 travels in the + X direction while maintaining its polarization characteristic, and is incident on the dichroic mirror 105 which is disposed to be inclined with respect to the chief ray of the incident light.

  The dichroic mirror 105 has spectral characteristics as shown in FIG. Incidentally, the light emitted from the blue laser diode unit 101 has polarization polarization (ie, polarization light), and in this embodiment, it is configured to be incident as P-polarization light on the dichroic mirror 105. . The vertical broken line in FIG. 2 indicates 455 nm, which is the central wavelength of the light emitted from the blue laser diode unit 101. The blue laser diode unit 101 is an example of an excitation light source.

  As described above, the incident light to the dichroic mirror 105 is transmitted therethrough to be incident on the λ / 4 plate 106 which is a 1⁄4 wavelength plate. The λ / 4 plate 106 is placed so that linearly polarized incident light is vertically incident. The incident light entering the λ / 4 plate 106 is linearly polarized light, but the phase axis of the λ / 4 plate 106 is set such that the transmitted light transmitted through the λ / 4 plate 106 is circularly polarized. Generally, the phase axis is arranged to be 45 degrees with respect to the polarization axis of incident light, but here, the angle can be covered to adjust the angle of the phase axis with respect to the polarization axis of incident light The λ / 4 plate 106 is supported.

  The light transmitted through the λ / 4 plate 106 is incident on condenser lenses 107 and 108, and is condensed on the phosphor of the phosphor device 110 to form a spot. The condenser lenses 107 and 108 are integrally housed in the lens barrel 109, and the lens barrel 109 is movable on the optical axis so as to be able to adjust the distance from the phosphor of the phosphor device 110. As a result, the range of the excitation light focused on the phosphor is a range (focusing range 112) as shown by a broken line in FIG. The focusing range 112 is determined by the spread angle of light from the blue laser diode unit 101, the diameter of the luminous flux, the specification of the diffusion plate 104, and the distance between the condenser lenses 107 and 108 and the phosphor. Here, as shown in FIG. 3, the phosphor is composed of six phosphor pieces 111a, 111b, 111c, 111d, 111e and 111f. In addition, a plurality of phosphor pieces may be collectively referred to as phosphors 111.

  As shown in FIG. 3 and FIG. 4, the phosphor device 110 transmits light of the phosphor 111 (phosphor pieces 111 a, 111 b, 111 c, 111 d, 111 e, 111 f) and the reflection layer 113 provided on the back surface thereof. It is fixed to a spreader 115 made of a material such as copper having excellent thermal conductivity via a conductive adhesive layer 114. In this embodiment, a heat sink 116 as a heat dissipating means is integrally configured. The spreader 115 is generally called a heat spreader.

  The phosphor 111 receives light from the blue laser diode unit 101 as excitation light and emits fluorescence. The phosphor 111 is made of a ceramic plate which is an inorganic material. The reflective layer 113 provided between the phosphor 111 and the spreader 115 has a property of reflecting light of the wavelength of fluorescence emitted by the phosphor 111.

  The phosphor 111 absorbs about half of the incident light which is excitation light, and the rest is heat. On the other hand, when the temperature becomes too high, a phenomenon occurs in which the conversion efficiency is reduced, which is temperature quenching, so that appropriate heat dissipation needs to be realized to prevent the output decrease and the heat generation increase. Therefore, the reflective layer 113 is a very thin layer by vapor deposition and the like, and the influence on the thermal conductivity is small, and the adhesive layer 114 is desirably a material having excellent thermal conductivity, and the film thickness is thin (for example, 20 microns or less) ) Is set. When the phosphor is integrated and the excitation energy is large, there is a concern that the phosphor may be broken due to the difference between the thermal expansion amount caused by the temperature rise of the phosphor and the thermal expansion amount of the spreader 115 fixed. Because of the small amount, improvement can be achieved with a small gap necessary for assembly between the divided phosphors and the different materials disposed therebetween. In particular, this is remarkable when the phosphor is made of ceramic or the like.

  As shown in FIG. 3 and FIG. 5 showing a part of a view on arrow A in FIG. 3, reflection areas 117a and 117b are provided between the phosphor pieces 111a, 111b, 111c, 111d, 111e and 111f. There is. Here, as shown in FIG. 5, the reflection area provided on the spreader 115 which is the base material is provided such that its surface (reflection surface 117s) is zigzag or uneven, and the incident light is diffused to some extent. It has a width and is configured to specularly reflect. The reflection surface 117s in this reflection area is formed on a convex reference spherical surface (one-dot chain line shown in FIG. 5, an example of a reference surface) which spreads and reflects incident light from the front. In this way, the reflected light is reflected with spread while being specularly reflected. As a result, the incident blue light is circularly polarized when it passes through the λ / 4 plate 106 and reaches here, but even if it is reflected by the reflection surface 117s, the polarization characteristic is maintained, so it becomes circularly polarized in reverse rotation. Again, with a constant divergence angle, return to the condenser lenses 108, 107 again.

  The reflection areas 117 a and 117 b have an area of about 20% in the condensing area 112. As described above, it is desirable that the reflection areas 117a and 117b be formed so that the above-mentioned area ratio does not greatly change even if the magnification or the position changes somewhat due to the variation of the elements related to the light collection range 112. Specifically, it is not desirable that the area ratio changes suddenly in the central part or the peripheral part, or that the area largely changes in the part corresponding to the boundary in the design value of the condensing range 112. The phosphor 111 has a characteristic of emitting yellow light upon receiving blue light (excitation light), and the area ratio of the phosphor surface of the phosphor 111 on which the excitation light is incident to the reflection surface of the reflection areas 117a and 117b is fluorescence As this is the main factor that determines the ratio of yellow light emitted in the body area to blue light reflected in the reflection area, if this is largely changed, the white quality of white light can not be ensured.

  Here, in the focusing range 112 on the focusing plane of the excitation light, it is desirable that the design center be defined by the ratio of the reflecting plane of the reflection area to the phosphor plane of 10 to 20: 100. When the ratio of the phosphor surface decreases, the brightness is affected. On the other hand, the surface state of the reflection area and the disturbance of the polarization characteristics are not zero, and the loss of blue light is increased. There is. In addition, when the focusing spot size (focusing range 112), which is the effective range of excitation light formed on the reflecting surface and the phosphor surface, fluctuates at an area change rate of ± 20% or less due to optical variation, the reflection area It is desirable that the change ratio of the area ratio of the reflection surface to the phosphor surface be equal to or less than half of the area change ratio (for example, 25% at 20/100 for the reflection area / phosphor surface).

  In the example shown in FIG. 3, the reflection area 117a is formed between the phosphor piece 111a and the phosphor piece 111c, but the reflection area is, for example, between the phosphor piece 111a and the phosphor piece 111b. May be formed.

  In this manner, the blue light reflected by the reflection surfaces of the reflection areas 117a and 117b becomes circular polarization of reverse rotation to the λ / 4 plate 106 and is re-incident and transmitted, thereby being orthogonal to the polarization direction at the time of incidence The light becomes S-polarized light and is incident on the dichroic mirror 105. As shown in FIG. 2, since blue light of the same wavelength of 455 nm center but s-polarized light is reflected by the dichroic mirror 105, it travels in the + Y direction. The blue light passes through a lens 118, a mirror 119, and a lens 120, and is condensed on the incident surface of a rod integrator 121 having a rectangular opening.

  Yellow fluorescent light is emitted from the portion of the fluorescent substance 111 in the focusing range 112 by receiving blue light as excitation light. Incidentally, the phosphor in this embodiment has a relatively high conversion efficiency, and uses a YAG phosphor that is mainstream in the light source market. The yellow light generated here is returned to the condenser lenses 108 and 107 again as with the blue light. The fluorescence light transmitted through this is incident on the λ / 4 plate 106, but the fluorescence characteristic is not affected by the polarization characteristic at this λ / 4 plate 106 since the polarization characteristic is canceled, and the fluorescence light is incident on the dichroic mirror 105. Do. Since the dichroic mirror 105 has a characteristic of reflecting light of 440 nm or more regardless of the polarization characteristic as shown in FIG. 2, the incident yellow light is the same as the blue light, and the lens 118, mirror 119, lens 120 The light is condensed on the incident surface of a rod integrator 121 having a rectangular opening.

  The light emitted from the rod integrator 121 enters the relay optical system 122, passes through the relay lenses 123 and 124, is reflected by the return mirror 125, passes through the field lens 126, and enters the total reflection prism 127. The total reflection prism 127 is configured by fixing a first prism 128 and a second prism 129 with a slight gap. The light incident on the total reflection prism 127 is totally reflected by the total reflection surface 130, and then enters the color prism unit 131.

  The color prism unit 131 includes a first prism 133 having a dichroic mirror surface 132 having a characteristic of reflecting blue light, and a second prism 135 having a dichroic mirror surface 134 having a characteristic of reflecting red light. And the third prism 136 is adhesively fixed. As shown in FIG. 1, DMDs 137, 138, and 139 are provided on the end face of each prism. In these DMDs (digital micro mirror devices), minute mirrors are two-dimensionally arranged, and the tilt directions thereof are controlled in two directions in accordance with an external video signal. The reflected light returns to the color prism unit 131 at an incident angle of 0 ° at the tilt angle when the ON signal, and reenters with a large angle when the OFF signal, DMD 137 for blue light modulation, DMD 138 for red light modulation , DMD 139 is for green light modulation. The DMD is an example of an image display element that modulates the light emitted from the illumination device with a video signal to generate video light.

  Thus, the image light corresponding to the white display mode ON signal) in each pixel in the DMDs 137, 138, and 139 is returned to the color prism unit 131 again, and the first prism 128 of the total reflection prism 127, the second The light passes through the prism 129 and is incident on the projection lens 140 and reaches a screen (not shown). Thus, color display can be realized.

  With this configuration, the phosphor light source illumination device 100 can process yellow light and blue light on the same light path in one block, so that a simple and compact system can be realized. In the present embodiment, the phosphor light source illumination device 100 is used for the projection type image display device 10, and the image display element is DMD. However, the present invention is not limited to this. Are replaceable.

  The phosphor light source lighting device 100 of the present embodiment is an example of a lighting device, and it is possible to deploy as a lighting device by arranging a lens group for expanding illumination toward the front instead of the image display element on the emission side. Not even until. Further, since the phosphor light source lighting device of the present disclosure can be used as a lighting device if it is configured by an excitation light source, a phosphor device, and an optical system minimum between them, for example, the rod integrator 121 can Absent.

  Although the reflection areas 117a and 117b having reflection surfaces provided in a zigzag or uneven shape between the phosphor pieces 111a, 111b, 111c, 111e, and 111f are provided on the base material, here, polarization of incident light is configured. Any configuration may be used as long as it reflects light without affecting the characteristics. That is, even if the reference spherical surface of the reflecting surface 117s shown in FIG. 5 is not a convex shape, it is possible to obtain the same effect even if it has a concave shape. Then, minute bumps and dips are provided on the reference spherical surface.

  In addition, as shown in FIG. 6, a transparent member 142 (an example of a light transmitting member) provided with a diffusing unit 141 having a light transmission characteristic on the reflecting surface and a reflecting layer 143 on the surface facing the reflecting surface as shown in FIG. The reflective area may be formed by fixing the adhesive layer 144 to the spreader 115. Needless to say, it is also possible to set the reference spherical surface on the reflective surface side, the reflective layer 143 side, or both.

  Further, as in the second modification shown in FIG. 7, it is also possible to make the reflective region by mixing the beads 146 having different refractive indexes in the transparent material 145 and providing a diffusion function. Also in this case, the transparent material 145 is fixed to the spreader 115 by the adhesive layer 144 via the reflective layer 143. However, if the degree of diffusion is large due to the setting of the amount of beads and the refractive index, it becomes difficult to maintain the polarization characteristics and the amount of light available decreases, so it is necessary to suppress the polarization characteristics to a maintainable level.

  FIG. 8 is a front view of a phosphor device 210 according to a third modification. As shown in FIG. 8, changing the shape of the reflection surface of the reflection areas 147a, 147b, 147c, 147d and the phosphor surface of the phosphor pieces 148a, 148b, 148c, 148d is the light spot size (light collection range 112) Is desirable in that the change in the area ratio of the reflecting surface to the phosphor surface can be suppressed when the. FIG. 9 shows a side view of the phosphor device 210 shown in FIG. Here, the reflecting surface is formed by forming the surface of the spreader 115 with a partially uneven material surface or by forming it in a sawtooth zigzag shape.

  In this case, as in the modified example 1 shown in FIG. 6, the reflection area may be formed by providing unevenness on the surface of the light transmitting member and providing a reflective layer on the back side, or the modified example shown in FIG. As in 2, the light transmitting material may be mixed with beads having different refractive indexes to have a diffusion function, and a reflective layer may be provided on the back surface.

  In the above embodiment, the phosphor is composed of an inorganic phosphor, particularly ceramic, and adhered to the spreader by the adhesive layer, but even the inorganic phosphor can be formed directly on the spreader, or mixed with a binder like an organic phosphor. What can be applied directly on the spreader does not need an adhesive layer, and only the reflective layer may be formed between the spreader and the spreader.

  In the above embodiments, in the phosphor devices 110 and 210, the phosphor 111 and the reflective layer 113 provided on the back surface thereof are made of a material such as copper (copper having excellent thermal conductivity through the adhesive layer 114) And the heat sink 116, and it is not limited to this. It can also be configured by fixing the phosphor and the spreader with a light transmissive adhesive containing a reflective material as the reflective layer. Furthermore, it is possible to fix the phosphor by diffusion bonding with the reflection layer interposed between the phosphor and the spreader, without providing the reflection layer between the phosphor and the spreader, and according to this, it is possible to adhere to the adhesion layer It can dissipate heat efficiently without heat resistance. This is also applicable to the configuration of the reflection area shown in FIG. 6 and FIG.

  In the above embodiment, an example of using a copper material as the spreader 115 is shown, but the requirement as the spreader is that it is desirable that the first is high thermal conductivity and second is low thermal expansion, so the excitation energy is small. In this case, the cost can be reduced by using an aluminum material, particularly a pure aluminum material. On the other hand, when the excitation energy is large, the problem can be solved by using a ceramic such as silicon carbide having high thermal conductivity and low thermal expansion. As described above, unlike the phosphor wheel, the spreader is fixed in the projection type image display apparatus, and the cooling means is provided on the surface other than the portion on which the phosphor is mounted or in the inside thereof. In the present embodiment, the heat sink 116 is used as the cooling means, but it goes without saying that this can be changed to other means such as liquid cooling.

  In addition, although the configuration using the YAG phosphor having a high conversion efficiency in the visible region has been described, an illumination device for obtaining an output light by finally mixing the wavelength of excitation light and the wavelength of fluorescence, or projection type image display It is applicable to the configuration of the device.

  The present disclosure is applicable to a lighting device using a phosphor or a projection type video display device.

DESCRIPTION OF SYMBOLS 10 Projection type video display apparatus 100 Fluorescent substance light source illuminating device 101 Blue laser diode unit 102, 103, 118, 120 Lens 104 Diffusion plate 105 Dichroic mirror 106 λ / 4 plate 107, 108 Condenser lens 109 Barrel 110, 210 Phosphor device DESCRIPTION OF SYMBOLS 111 fluorescent substance 111a, 111b, 111c, 111e, 111f, 148a, 148b, 148c, 148d fluorescent substance piece 112 condensing range 113, 143 reflective layer 114, 144 adhesion layer 115 spreader 116 heat sink 117a, 117b, 147a, 147b , 147c, 147d reflection area 117s reflection surface 119, 125 mirror 121 rod integrator 122 relay optical system 123, 124 relay lens 126 field lens 12 Total reflection prism 128 First prism of total reflection prism 129 Second prism of total reflection prism 130 Total reflection surface of total reflection prism 131 color prism unit 132 blue reflection dichroic mirror surface of color prism 133 first prism of color prism 134 Red reflective dichroic mirror surface of color prism 135 Second prism of color prism 136 Third prism of color prism 137 DMD for blue light
138 DMD for red light
139 DMD for green light
140 projection lens 141 diffusing means 142 transparent member 145 transparent material 146 bead

Claims (19)

An excitation light source for emitting polarized light;
A phosphor that emits fluorescence light when the polarized light from the excitation light source is incident as excitation light;
A spreader supporting the phosphor;
And a reflective layer provided between the phosphor and the spreader to reflect the fluorescent light.
In the phosphor, a plurality of phosphor pieces having the same characteristics are disposed adjacent to each other on the reflection layer, and a reflection area is reflected between the plurality of phosphor pieces while maintaining polarization characteristics of the excitation light to be incident. The lighting equipment provided. Between the excitation light source and the phosphor,
An afocal optical system that collimates excitation light from the excitation light source;
A diffusion plate which diffuses the incident excitation light while maintaining the polarization characteristic;
A dichroic mirror that reflects light of a wavelength of the excitation light source of S polarization, transmits light of P polarization of the same wavelength, and is disposed obliquely to the incident excitation light;
A quarter wavelength plate on which excitation light from the excitation light source is incident;
The condenser apparatus which condenses the said excitation light which injects on the said fluorescent substance, and forms a spot, The illuminating device of Claim 1 characterized by the above-mentioned.   The lighting device according to claim 1, wherein the reflective layer is formed on a surface of the phosphor, and an adhesive layer is provided between the reflective layer and the spreader.   The lighting device according to claim 1, wherein the reflective layer is formed on a surface of the spreader, and a light transmitting adhesive layer is provided between the phosphor and the reflective layer.   The lighting device according to claim 4, wherein the reflective layer is formed by adding a reflective material to a light transmitting adhesive.   The lighting device according to claim 1, wherein the phosphor is made of an inorganic material.   The lighting device according to claim 6, wherein the phosphor is a ceramic plate made of an inorganic material.   The lighting device according to claim 1, wherein the spreader is made of an aluminum material, a copper material or silicon carbide.   The lighting device according to claim 1, wherein the excitation light source is a blue laser, and the phosphor receives the excitation light and emits yellow light.   The lighting device according to claim 1, wherein the phosphor is fixed to the spreader by diffusion bonding with the reflection layer interposed therebetween.   The lighting device according to claim 1, wherein the spreader is fixed and has a cooling means on a surface other than the portion equipped with the phosphor or in the inside.   The illumination device according to claim 1, wherein the reflection surface of the reflection area where the excitation light is incident has unevenness.   The lighting device according to claim 1, wherein the reflection area includes a light transmission member, and a reflection layer provided between the light transmission member and the spreader.   The lighting device according to claim 1 or 13, wherein the reflection surface of the reflection area on which the excitation light is incident is provided with micro unevenness on a convex or concave reference surface. The reflection area has a reflection surface on which the excitation light is incident,
The plurality of phosphor pieces have a phosphor surface on which the excitation light is incident,
The lighting device according to claim 1, wherein an area ratio of the reflection surface to the phosphor surface is 10 to 20: 100. The reflection area has a reflection surface on which the excitation light is incident,
The plurality of phosphor pieces have a phosphor surface on which the excitation light is incident,
When the area change rate of the effective range of the excitation light incident on the phosphor fluctuates by ± 20% or less, the change rate of the area ratio of the reflecting surface to the phosphor surface in the effective range is the area change rate The lighting device according to claim 1, wherein the lighting device is configured to fit within half of or less.   The lighting device according to claim 2, wherein the quarter-wave plate is disposed such that the polarized light is vertically incident, and an angle of a phase axis with respect to a polarization axis of the polarized light is adjustable.   The lighting device according to claim 2, wherein a distance between the phosphor and the condenser lens is configured to be adjustable. A lighting device according to any one of claims 1 to 18,
An image display element that generates video light by modulating light emitted from the lighting device with a video signal;
A projection lens for enlarging and projecting the image light generated by the image display element;
A projection type video display device provided with

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