JP7271252B2 - projection display - Google Patents

Description

The present invention relates to a projection display device.

2. Description of the Related Art In recent years, so-called motion-specification projectors, which are installed inside simulation devices for amusement and aircraft simulator applications, are increasing. On the other hand, the number of pixels and the image quality of projectors are increasing, and projectors with high image quality are being selected in order to pursue realism of images even in motion projectors. Under such circumstances, the projector is required to have a structure that does not affect the image quality even when the simulator device is operated or is vibrated due to the environment of the installation location. For example, Patent Literature 1 discloses a motion projector.

Patent No. 3858488

However, in the configuration disclosed in Patent Document 1, when the projector becomes brighter, the projector housing becomes larger and the weight of the projector increases due to cooling of each part and the like. As the weight of the projector increases, the acceleration applied to the housing increases, and the impact of projector vibration on motion specifications increases. Further, when the internal components of the projector are enclosed by a box-shaped housing member, the housing may resonate at the frequency at which the simulator device operates, for example, causing image shake or the like.

On the other hand, simply increasing the thickness of the members forming the housing increases the weight of the projector and further increases the acceleration applied to the housing. As a result, there is a possibility that the projected image will shake and the image quality will deteriorate.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a projection display apparatus which is compact, lightweight, and has high image quality.

According to one aspect of the present invention, there is provided a projection-type display apparatus comprising: a housing portion capable of housing a light source unit, a light modulation element, and an optical system for illuminating the light modulation element with light from the light source unit; and a reinforcing member extending from the outer surface of the accommodating portion to the inner surface of the casing portion and fixed to the outer surface of the accommodating portion and the inner surface of the casing portion. A plurality of reinforcing members are provided, and at least a portion of the plurality of reinforcing members that is fixed to the inner surface of the housing is provided to be fixed to a side surface of the housing. ing.

Other objects and features of the invention are described in the following embodiments.

According to the present invention, it is possible to provide a projection display device that is small and lightweight and capable of projecting high-quality images.

1 is a side view of a projection display device according to each embodiment; FIG. 1 is a top view of a projection display device according to each embodiment; FIG. 1 is a perspective view of a projection display device according to a first embodiment; FIG. 1 is a front view of a projection display device according to a first embodiment; FIG. 1 is a configuration diagram of a projection display device according to a first embodiment; FIG. 1 is a configuration diagram of a projection display device according to a first embodiment; FIG. FIG. 10 is a perspective view of a projection display device according to a second embodiment; FIG. 10 is a configuration diagram of a projection display device according to a second embodiment; FIG. 10 is a perspective view of a projection display device according to a second embodiment; FIG. 10 is a front view of a projection display device according to a second embodiment; It is a modification of the connection part in 2nd Embodiment. 1 is a configuration diagram of a projection display device according to a first embodiment; FIG. FIG. 11 is a perspective view of a projection display device according to a third embodiment; FIG. 11 is a front view of a projection display device according to a third embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, the configuration of a projection display device (liquid crystal projector) according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a side view of the projection display device 100. FIG. FIG. 2 is a top view of the projection display device 100. FIG. Here, a liquid crystal projector using a reflective liquid crystal panel as a light modulation element will be described, but the present invention is applicable to a projector apparatus using other light modulation elements such as a DMD (Digital Mirror Device) or a transmissive liquid crystal display element. is also applicable.

Light emitted from the light source unit enters the fly-eye lens 3 . The light source unit here is a general term for the light source (light source bulb, light source lamp) 1 and the reflecting mirror (parabolic mirror) 2 that reflects the light from the light source 1 . The light pupil-divided by the fly-eye lens 3 enters the fly-eye lens 4 and then the PS conversion element 5 . The PS conversion element 5 aligns the random polarized light emitted from the light source unit into P polarized light and emits it.

The light condensed by the condenser lens 6 then enters the color separation optical system. A dichroic mirror 7 separates the light from the condenser lens 6 into straight green light and magenta light. The green light traveling straight is converted into S-polarized light by the half-wave plate 8, enters the polarizing beam splitter 9, is reflected by the reflecting surface, passes through the quarter-wave plate 10, and then enters the green panel 11 (for G color light). reflective liquid crystal panel). The light modulated by the green panel 11 enters the quarter-wave plate 10 again and then enters the color synthesizing prism 18 .

On the other hand, magenta light (blue light and red light) enters the color select element 12 . The color select element 12 converts the red light into, for example, P-polarized light, and the blue light enters the polarizing beam splitter 13 as S-polarized light. The S-polarized blue light is reflected by the reflecting surface of the polarization beam splitter 13 . On the other hand, the P-polarized red light passes through the reflecting surface of the polarization beam splitter 13 .

Next, the blue light enters a blue panel (reflective liquid crystal panel for B-color light) 17 after passing through the quarter-wave plate 16 . The light modulated by the blue panel 17 enters the quarter-wave plate 16 again and then enters the color synthesizing prism 18 . The red light is incident on a red panel (reflective liquid crystal panel for R color light) 15 after passing through the quarter-wave plate 14 . The light modulated by the red panel 15 enters the quarter-wave plate 14 again, is reflected by the polarizing beam splitter 13 , and then enters the color synthesizing prism 18 . A color combining prism 18 combines red, green, and blue light to generate white light. The projection lens 19 projects the white light synthesized by the color synthesizing prism 18 onto a projection surface (not shown) such as a screen.

The optical engine (accommodating portion) 31 includes a light source unit, panels 11, 15 and 17, and an optical system (fly eye lenses 3 and 4, PS conversion element 5, condenser lens 6, dichroic optical parts such as the mirror 7). The projection lens 19 is supported and fixed by a lens shift mechanism 20 , which is connected to and integrated with an optical engine 31 . The lens shift mechanism 20 holds the projection lens 19 movably within a plane normal to the optical axis OA. By moving the projection lens 19, the position of the projected image can be arbitrarily adjusted.

A housing (exterior) 21 of the projection display device 100 accommodates an optical engine 31 . The optical engine 31 is arranged, for example, substantially in the center of the housing section 21 (center layout configuration). The reason for adopting the center layout configuration is as follows. When the projection type display device 100 is installed facing the screen, it is installed on the ceiling using, for example, a ceiling bracket. At this time, if the center of the screen, the center of the ceiling bracket, and the center of the projection lens 19 are aligned with each other, the adjustment amount of the image position by the lens shift mechanism 20 can be minimized. By reducing the amount of shift adjustment from the reference position in order to maintain a higher quality projection image, light can pass through the vicinity of the optical axis OA of the projection lens 19, so that the aberration of the projection lens 19 can be minimized. be possible.

On the other hand, when the center layout configuration is adopted, image vibration in the installation environment of the projection display device 100 may affect image quality. For example, resonance may occur due to vibration of a cooling fan installed inside the projection display device 100, or resonance may occur due to vibration transmitted from an external device to the projection display device depending on motion specifications. .

Here, simulation results regarding the resonance mode that occurs when vibration due to rotation of the cooling fan or vibration due to motion specifications is input to the projection display device 100 will be described.

FIG. 3 is a perspective view of the projection display device 100. FIG. FIG. 4 is a front view of the projection display device 100. FIG. FIG. 3 shows a state in which the optical engine 31 is held in the center of the casing 21 of the projection display device 100 (a state in which the bottom surface of the optical engine 31 is screwed to the bottom of the casing 21). . As shown in FIG. 3, the direction parallel to the direction (optical axis direction) along the optical axis OA of the projection lens 19 is the X direction, and the direction perpendicular to the X direction and parallel to the lateral direction of the casing 21 is is defined as the Y direction, and the direction perpendicular to the X direction and parallel to the height direction of the housing 21 is defined as the Z direction.

The projection display device 100 has installation portions (installation fixing portions) 23 and 24 . The projection display device 100 is installed at a predetermined position via the installation units 23 and 24 . As a result of vibration mode analysis, the first resonance occurs around several tens of Hz. In this vibration mode, as indicated by arrow 22 in FIG. It vibrates (amplitude of housing when vibrating). Such vertical vibration causes the optical engine 31 to sway in the vertical direction, thereby causing the projection screen to sway in the vertical direction.

With a frequency of several tens of Hz, there is a possibility that the projected image shakes. In order to avoid such a resonance phenomenon, it is effective to increase the rigidity of the housing portion 21 by increasing the plate thickness of the housing portion 21 . However, the overall weight of the projection display device 100 increases, and the acceleration during vibration increases, which may increase the influence of resonance. For this reason, it is preferable to change the resonance frequency by connecting and fixing internal parts such as the optical engine 31 and the housing part 21 using a small number of reinforcing members. Specifically, it is necessary to increase the frequency to about several hundred Hz at which the projected image becomes invisible.

Next, referring to FIG. 5, a shape optimization calculation (a finite analysis method based on a density method) for maximizing the first-order resonance frequency in a state in which the optical engine 31 is attached to the housing portion 21 (a state in which it is housed) is performed. A description will be given of a configuration that has been implemented and yielded the most desirable results. FIG. 5 is a configuration diagram of the projection display device 100 determined by shape optimization calculation. FIG. 5(a) is a front view of the projection display device 100, and FIG. 5(b) is a top view of the projection display device 100, showing results determined by shape optimization calculation. According to this result, by increasing the strength of the housing by using the reinforcing member and arranging the installation section 23 of the housing section 21 in the vicinity of the optical engine 31, the size of the reinforcing section can be reduced and the maximum The influence of resonance can be reduced.

In this embodiment, the projection display device 100 has a plurality of connecting portions 25 that connect the outer surface of the optical engine 31 and the inner surface of the housing portion 21 . The connecting portion 25 is a reinforcing member (fixing member) that reinforces the strength of the projection display device 100 . The connecting portion 25 extends in the X direction and the Y direction so as to extend from the optical engine 31 toward the housing portion 21 (from the lower side of the outer surface of the optical engine 31 toward the upper side of the inner surface of the housing portion 21). ing. One of the extending connecting portions 25 is fixed to the outer surface of the optical engine 31 , and the other of the extending connecting portions 25 is fixed to the inner surface of the housing portion 21 . As a fixing method, screwing, adhesion, welding, welding, or the like can be used.

Also, at this time, the side of the connecting portion 25 that contacts the inner surface of the housing portion 21 needs to be fixed to the side surface of the housing portion 21 or the upper or lower surface of the housing portion 21 . That is, some of the plurality of connecting portions 25 need to be fixed to at least the side surface of the housing portion 21, and other portions of the plurality of connecting portions 25 need to be fixed to at least the upper surface of the housing portion 21. is. Thereby, the strength of the housing can be strengthened, and the influence of resonance can be reduced. Further, as shown in FIG. 5, one connecting portion 25 may be provided so as to be fixed to the upper surface and the side surface of the housing portion 21 . By providing the plurality of connecting portions 25 in this way, the strength of the housing can be enhanced and the influence of resonance can be reduced. In this embodiment, the upper surface refers to the inner surface that is on the upper side in the direction of gravity when the projection display apparatus 100 is arranged as shown in FIG. The inner surface located on the lower side in the direction of gravity when the projection display device 100 is arranged is called the lower surface. The side surface of the housing portion 21 means the inner surface other than the side surface.

Next, with reference to FIG. 12, an example using a structure of the connecting portion 26 different from that of the connecting portion 25 of FIG. 5 will be described. 12A is a front view of the projection display device 100, and FIG. 12B is a top view of the projection display device 100. FIG. As shown in FIG. 12B, the connecting portion (reinforcing member) 26 radially extends from the optical engine 31 in the XY plane. Further, as shown in FIG. 12A, the connecting portion 26 has a plate-like shape (planar shape) in the Z direction. Even when the connecting portion 26 has such a structure, as in the example of FIG. Alternatively, by fixing to the lower surface, the strength of the housing can be strengthened, and the influence of resonance can be reduced.

Incidentally, it is known that the vibration (amplitude) at the center of the housing 21 increases as the installation portion 24 of the housing 21 moves away from the center of the housing 21 . Therefore, as shown in FIGS. 5 and 12, the installation portion 24 is preferably arranged near the center of the housing portion 21 as much as possible. This is because it is expected that the reinforcing member for suppressing the amplitude will increase in size.

An optimum example of preventing the size of the reinforcing member from increasing even when the installation portion is arranged near the outer periphery of the housing portion 21 will be described with reference to FIG. FIG. 6 shows an example in which the result of the shape optimization calculation is the best when the installation portion 23 is arranged in the vicinity of the outer periphery of the housing portion 21 . FIG. 6 is a configuration diagram of a projection display apparatus 100 having an installation section 23 arranged near the outer circumference by moving the installation section 24 provided near the center of the housing section 21 of the projection display apparatus 100 of FIG. be. 6A is a front view of the projection display device 100, and FIG. 6B is a top view of the projection display device 100. FIG.

As shown in FIG. 6B, the connecting portion (reinforcing member) 26 radially extends from the optical engine 31 in the XY plane. Further, as shown in FIG. 6A, the connecting portion 26 has a plate-like shape (planar shape) in the Z direction. As compared with the configuration of the connecting portion 25 of FIG. 5, the volume of the connecting portion 26 of FIG. Even if the portion is located near the outer periphery, the influence of resonance can be reduced.

Similar shape optimization calculations were performed while changing the distance from the optical engine 31 to the installation portion 23 . As a result, when the installation section 23 is arranged within 50% of the distance from the optical engine 31 to the housing section 21 (FIG. 5(b), inside the dotted line 35 in FIG. 6(b) ), the vibration could be effectively suppressed. Thus, in this embodiment, preferably, the installation portion 24 is arranged closer to the end portion (A) of the optical engine 31 than the outer edge portion (B) of the housing portion 21 . In other words, the distance from the installation portion 24 to the end (A) of the optical engine 31 is 50% or less of the distance from the end (A) of the optical engine 31 to the outer edge (B) of the housing portion 21. be. By arranging the installation portion 24 in such a region and forming the connecting portion 25 in a shape extending in the X direction and the Y direction, the weight of the connecting portion 25 can be reduced.

In this embodiment, connecting portions 25 and 26 are used to connect the respective walls of the optical engine 31 and the housing portion 21 . With such a configuration, it is possible to reduce the size and weight of the connecting portion (reinforcing member), and it is possible to improve the resonance frequency to several hundred Hz, which is a level that cannot be visually recognized as a projected image.

(Second embodiment)
Next, a projection type display device (liquid crystal projector) according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 10. FIG. FIG. 7 is a perspective view of the projection display device 100a. 8A and 8B are configuration diagrams of a projection display device 100a, FIG. 8A showing a front view and FIG. 8B showing a plan view. FIG. 9 is a perspective view of the projection display device 100a in which the connecting portion 32 is provided on the projection display device 100a. FIG. 10 is a front view of the projection display device 100a with the connecting portion 32 provided. Although the present embodiment describes a liquid crystal projector using a reflective liquid crystal panel as an optical modulation element, the present invention is applicable to a projector apparatus using other optical modulation elements such as a DMD (Digital Mirror Device) or a transmissive liquid crystal display element. It is also applicable to

The projection display apparatus 100a includes, as units other than the optical engine 31, a main board 27a for controlling the overall operation of the projection display apparatus 100a, an electrical unit 27 having a liquid crystal drive board, a cooling device 28a, and a light source drive power supply. It has a cooling unit 28 with a substrate. The electrical unit 27 and the cooling unit 28 are arranged on the side of the optical engine 31 so as to sandwich the optical engine 31, and are fixed to the lower part of the casing 21 in FIG. 8 by screws or the like. In such a configuration, it may be difficult to separately provide a large connecting portion (reinforcing member) as described in the first embodiment. Therefore, in the present embodiment, it is preferable to use a part of each of the electrical unit 27 and the cooling unit 28 to serve also as a reinforcing member.

As shown in FIG. 10, the optical engine 31, the electrical unit 27, and the cooling unit 28 are fixed to the lower portion of the housing 21 with screws. As shown in FIG. 9 , the connecting portions 32 are connected to each other by screwing or the like in the upper portion of the housing portion 21 so as to extend from the optical engine 31 to the electrical unit 27 and the cooling unit 28 . The connecting portion 32 is connected to the side surface and upper surface of the housing portion 21 by extending in the X direction, the Y direction, and the Z direction. That is, the side of the plurality of connecting portions 32 on which the optical engine 21 is fixed to the housing portion 21 is connected via the inner surface of the housing portion 21 or other units such as the electrical unit 27 and the cooling unit 28 other than the optical engine 31 . It is fixed to the inner surface of the housing part 21 . At least a portion of the connecting portions 32 fixed to the inner surface of the housing portion 21 among the plurality of connecting portions 32 is preferably fixed to the side surface of the housing portion.

With such a configuration, even if vibrations are transmitted to the optical engine 31 via the connecting portion between the housing portion 21 and the optical engine 31, it is possible to avoid image shake due to resonance at frequencies that have an effect, so that high image quality can be achieved. A projection display device can be provided. As a result of the simulation, it was possible to confirm the effect of increasing the resonance frequency by about 50% compared to the configuration in which the connecting portion 32 is not provided.

Next, with reference to FIG. 11, a modification of the connecting portion 32 in this embodiment will be described. FIGS. 11A and 11B are modifications of the connecting portion 32. FIG. In the present embodiment, a portion of the connecting portion 32 may have an elastic structure (spring structure) 32a as in the respective modifications shown in FIGS. 11(a) and 11(b). The resilient structure 32a acts as a rigid body during normal use and as a stress relieving soft body when dropped.

(Third Embodiment)
Next, a projection display device (liquid crystal projector) according to a third embodiment of the present invention will be described with reference to FIGS. 13 and 14. FIG. This embodiment is a modification of the second embodiment. FIG. 13 is a perspective view of the projection display device 100b. FIG. 14 is a front view of the projection display device 100b. In addition, in this embodiment, the description similar to that of the second embodiment is omitted. Although the present embodiment describes a liquid crystal projector using a reflective liquid crystal panel as a light modulation element, the present invention is applicable to a projector apparatus using other light modulation elements such as a DMD (Digital Mirror Device) or a transmissive liquid crystal display element. It is also applicable to

A plurality of connecting portions (reinforcing members) 321 extending in the X direction of the projection display device are fixed to the upper surface and side surfaces of the housing portion 21 by fixing portions 323 with screws or the like. A plurality of connecting portions (reinforcing members) 322 extending in the Y direction of the projection display device are fixed to the upper surface and the side surface of the housing portion 21 by fixing portions 324 with screws or the like. The optical engine 31, the electrical unit 27, and the cooling unit 28 are connected to the upper surface of the housing and either the connecting portion 321 or the connecting portion 322 by a connecting portion (reinforcing member) 325 extending in the Z direction. is provided in At this time, by connecting both the connecting portion 321 and the connecting portion 322, the strength can be further improved. By adopting such a structure, there is no need to increase the rigidity by increasing the thickness of the housing, so the rigidity can be maintained while the overall weight of the product is reduced. It is possible to realize a high-quality projector in which the influence of vibration is reduced as much as possible.

In this embodiment, the fixing portions 323 and 324 are all connected to the side and top surfaces of the housing portion 21 in order to connect the connecting portions 321 and 322 to the side surfaces of the housing portion 21, but this is not limitative. isn't it. For example, even if some fixing parts 323 and 324 are provided so as not to touch the side surface of the housing part 21, it is substantially possible to obtain substantially the same effect in the vicinity of the side edge. However, in that case, it is possible to increase the strength by partially increasing the thickness of the exterior of the part where the connecting part should be arranged at the ridge line where the side surface and the upper surface or the lower surface of the housing part 21 meet. preferable.

Further, in the present embodiment, an example in which the connecting portions 321 and 322 are arranged on the upper surface of the housing portion 21 is shown, but the present embodiment is not limited to this, and may be arranged near the optical axis of the projection lens. , the same effect can be obtained even if it is arranged in the lower part of the housing.

As described above, in each embodiment, the projection display device 100 (100a, 100b) includes a housing portion (optical engine 31), a housing portion 21, and reinforcing members (connecting portions 25, 26, 32, 321, 322, 325). The housing portion includes a light source unit, light modulation elements (liquid crystal panels: green panel 11, red panel 15, and blue panel 17), and an optical system (fly-eye lenses 3 and 4) for illuminating the light modulation elements with light from the light source units. , PS conversion element 5, condenser lens 6, etc.). The housing part accommodates the accommodation part. The reinforcing member extends from the outer surface (for example, the upper surface) of the housing portion to the inner surface (for example, at least one of the top surface and the side surface) of the housing portion, and is in contact with the outer surface of the housing portion and the inner surface of the housing portion. The side of the reinforcing member that contacts the inner surface of the housing is provided so as to be fixed to the side surface of the housing.

Preferably, a plurality of reinforcing members are provided, and at least some of the plurality of reinforcing members are provided such that the side fixed to each housing is fixed to a side surface of the housing. Also preferably, the reinforcing member is provided to extend in at least one of the X direction, the Y direction, and the Z direction from the accommodating portion toward the housing portion. Moreover, preferably, the projection display device has units (the electrical unit 27 and the cooling unit 28) accommodated in the casing. The unit, housing section, and housing section are connected by a reinforcing member.

In each embodiment, the reinforcing member (connecting portion 32) may be composed of a single metal plate (flat plate). Moreover, in each embodiment, the installation portion 24 is not limited to the leg portion provided on the housing portion 21 , and may be a screw hole formed in the housing portion 21 . Also, in each embodiment, the light source unit has a lamp as a light source, but is not limited to this. The light source unit may have, for example, a light source that emits white light using a laser and phosphor.

Also, the light source unit may be removable from the projector for the purpose of replacing it with a new one. In other words, it is sufficient that the accommodation section can accommodate the light source unit, the liquid crystal panel, and the optical system for illuminating the liquid crystal panel.

As described above, in each embodiment, when the projection type display device is mounted on the simulator device and operated, it is possible to suppress the influence of the resonance generated by the self-excited vibration and the disturbance vibration due to the environment of the installation place from affecting the image quality. can. For this reason, according to each embodiment, it is possible to provide a projection display device that is small and lightweight and capable of projecting a high-quality image.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.

1 light source 2 reflectors 3, 4 fly eye lens (optical system)
5 PS conversion element (optical system)
6 Condenser lens (optical system)
11 green panel (light modulation element)
15 red panel (light modulation element)
17 blue panel (light modulation element)
21 housing parts 25, 26, 32, 321, 322, 325 connecting part (reinforcing member)
31 optical engine (container)
100, 100a Projection type display device

Claims (11)

a housing portion capable of housing a light source unit, a light modulation element, and an optical system for illuminating the light modulation element with light from the light source unit;
a housing portion that houses the housing portion;
a reinforcing member extending from the outer surface of the housing portion to the inner surface of the housing portion and fixed to the outer surface of the housing portion and the inner surface of the housing portion;
A plurality of the reinforcing members are provided,
A projection display device , wherein at least some of the plurality of reinforcing members are fixed to the inner surface of the casing, and are fixed to the side surface of the casing. . The direction parallel to the optical axis direction of the projection lens is the X direction, the direction perpendicular to the X direction and parallel to the lateral direction of the casing is the Y direction, and the direction perpendicular to the X direction is the casing. When the direction parallel to the height direction is the Z direction,
3. The reinforcing member is provided to extend in at least one of the X direction, the Y direction, and the Z direction from the accommodation portion toward the housing portion. 2. The projection display device according to 1 . an installation portion provided in the housing portion for installing the projection display device;
3. The projection display device according to claim 1 , wherein the installation portion is arranged closer to the end portion of the housing portion than to the outer edge portion of the housing portion. 4. The projection display device according to claim 3 , wherein the installation portion is a leg portion provided on the housing portion. 4. A projection display apparatus according to claim 3 , wherein said installation portion is a screw hole formed in said housing portion. having a unit housed in the housing,
6. The projection display apparatus according to claim 1 , wherein said unit and said accommodating section are respectively fixed to said housing section by said reinforcing member. a housing portion capable of housing a light source unit, a light modulation element, and an optical system for illuminating the light modulation element with light from the light source unit;
a housing portion that houses the housing portion;
a reinforcing member extending from the outer surface of the housing portion to the inner surface of the housing portion and fixed to the outer surface of the housing portion and the inner surface of the housing portion;
having a unit housed in the housing,
A side of the reinforcing member fixed to the inner surface of the housing is provided to be fixed to a side surface of the housing,
A projection display device, wherein the unit and the accommodating section are fixed by the housing section and the reinforcing member, respectively. 8. A projection display apparatus according to any one of claims 1 to 7, wherein said reinforcing member is composed of a single metal plate. 9. A projection display apparatus according to any one of claims 1 to 8, wherein at least part of said reinforcing member has an elastic structure. 10. The projection display apparatus according to claim 1, wherein said light source unit has a lamp. 10. The projection display apparatus according to any one of claims 1 to 9, wherein said light source unit has a laser and a phosphor.

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