Projection-type display device

Abstract

A bottom surface part (10) constituting a housing of this projection-type display device comprises: metal bottom surface plate members (11, 12); and a rod-shaped bottom surface reinforcement beam (13) that is fixed to the main surface of the bottom surface plate members and extends along the main surface of the bottom surface plate members.

Description

Projection display device

[0001] The present invention relates to a projection display device.

[0002] Patent Document 1 discloses a projection display device (projector) in which a light source device, a light modulation device, and a projection optical device are housed in a housing (exterior housing), and a reinforcing metal frame is provided within the housing. In the configuration of Patent Document 1, when another projection display device is stacked on top of the projection display device, the other projection display device is supported by the metal frame to prevent deformation of the housing due to the weight of the other projection display device. Patent Document 2 discloses a projection display device (projector) in which a light source and optical components are housed inside the housing. In the projection display device of Patent Document 2, the housing is made of a filled resin or metal containing a filler with high thermal conductivity.

[0003] JP 2017-129657 A JP 2016-218259 A

[0004] In a projection display device, the multiple panels (bottom, top, side, etc.) that make up the exterior of the housing may be made of metal. Metal panels have the advantage of being less prone to molding defects and being stronger than typical resin panels. However, when the housing panels are made of simple flat metal plates, there is a problem in that the panels are prone to bending and deformation.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a projection display device that can suppress bending deformation of a panel that constitutes a housing.

[0006] A first aspect of the present invention is a projection display device in which the bottom portion of the housing comprises a metal bottom plate member and a rod-shaped bottom reinforcing beam fixed to the main surface of the bottom plate member and extending along the main surface of the bottom plate member.

[0007] A second aspect of the present invention is a projection display device in which the bottom surface of the housing is formed by stacking two metal bottom plate members in the thickness direction.

[0008] According to the present invention, it is possible to suppress bending deformation of a panel that constitutes the housing of a projection display device.

[0009] 10 is a perspective view showing the appearance of a projection display device according to an embodiment of the present invention. It is a perspective view showing the projection display device of FIG. 1 with the front, rear, left, right, and top surfaces of the housing and the support column cover members removed from the bottom surface of the housing and the frame. It is a perspective view showing the bottom surface of the housing of the projection display device of FIGS. 1 and 2. It is a cross-sectional view showing the bottom surface of FIG. 3. It is an exploded perspective view showing the bottom surface of FIG. 3 disassembled into two bottom surface plate members and a bottom reinforcing beam. It is an exploded perspective view showing the bottom surface of FIG. 4 disassembled into two bottom surface plate members and a bottom reinforcing beam. It is a perspective view showing a method of assembling the bottom surface of FIGS. 3 to 6. It is a perspective view showing a method of assembling the bottom surface, subsequent to FIG. 7. It is a perspective view showing a method of assembling the bottom surface, subsequent to FIG. 8. It is a perspective view showing a state in which a projection unit (light source unit, optical unit, power supply unit) is arranged on the inner surface of the bottom surface of the projection display device of FIGS. 1 and 2. It is a cross-sectional view taken along line XI-XI of FIG. FIG. 3 is a schematic diagram showing the projection units (light source unit, optical unit, power supply unit) arranged on the inner surface of the bottom surface of the projection display device of FIGS. 1 and 2, as viewed from above. FIG. 4 is an exploded perspective view of the front surface of the projection display device of FIGS. 1 and 2. FIG. 5 is an exploded perspective view of the rear surface of the projection display device of FIGS. 1 and 2. FIG. 6 is an exploded perspective view of the left surface of the projection display device of FIGS. 1 and 2. FIG. 7 is an exploded perspective view of the right surface of the projection display device of FIGS. 1 and 2.

[0010] An embodiment of the present invention will be described below with reference to Figures 1 to 16. In the following description, mutually corresponding components will be assigned the same reference numerals, and descriptions of overlapping parts may be omitted. Furthermore, in the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," and "center," not only strictly indicate such arrangements, but also indicate a state in which there is a relative displacement with a tolerance or an angle or distance that provides the same function.

[0011] In the drawings of this embodiment, the direction indicated by the symbol Z corresponds to the height direction of the projection display device described below. In the following description, this will sometimes be referred to as the Z direction. The side toward which the Z direction arrow points (+Z side) will sometimes be referred to as the "upper side." The side opposite to the side toward which the Z direction arrow points (-Z side) will sometimes be referred to as the "lower side."

[0012] The direction indicated by the symbol X is a linear direction perpendicular to the Z direction, and corresponds to the left-right direction (or width direction) of the projection display device. In the following explanation, this will be referred to as the X direction. The side toward which the X direction arrow points (+X side) will be referred to as the "left side," and the side opposite to the side toward which the X direction arrow points (-X side) will be referred to as the "right side."

[0013] The direction indicated by the symbol Y is a linear direction perpendicular to the Z and X directions, and corresponds to the front-to-rear direction of the projection display device (the direction parallel to the optical axis of the projection lens). In the following description, this will sometimes be referred to as the Y direction. The side toward which the Y arrow points (+Y side) will sometimes be referred to as the "rear side," and the side opposite to the side toward which the Y arrow points (-Y side) will sometimes be referred to as the "front side." The above-mentioned upper side, lower side, right side, left side, rear side, and front side are names simply used to describe the relative positional relationships of the various parts, and the actual positional relationships may be other than those indicated by these names.

[0014] 1 and 2, a projection display device (projector) 1 of this embodiment is a device for projecting image light (an image) onto a display surface such as a screen. The projection display device 1 includes a housing 2, a projection lens 3, and projection units 6 to 8.

[0015] The projection units 6 to 8 are units for projecting image light to the outside and are housed inside the housing 2. The projection units 6 to 8 include a light source unit 6, an optical unit 7, and a power supply unit 8. The light source unit 6 is a device that emits a light beam. The optical unit 7 optically processes the light beam emitted from the light source unit 6 to form an optical image corresponding to image information. In this embodiment, the optical unit 7 is configured by housing various optical components (lenses, mirrors, liquid crystal panels, etc.) in a dustproof box 70. The optical image formed by the optical unit 7 is projected to the outside through the projection lens 3. The power supply unit 8 stabilizes current input from the outside and supplies power to the light source unit 6, the optical unit 7, etc. These projection units 6 to 8, including the light source unit 6, the optical unit 7, and the power supply unit 8, have higher rigidity than the bottom plate members 11 and 12 of the housing 2, which will be described later.

[0016] The housing 2 includes a bottom surface portion 10 , a frame 20 , side surfaces 40 , and a top surface portion 30 .

[0017] The bottom surface 10 constitutes the lower surface of the housing 2. As shown in Figures 3 and 4, the bottom surface 10 is formed in a generally flat plate shape. The thickness direction of the bottom surface 10 faces the Z direction. The bottom surface 10 has a rectangular shape in plan view when viewed from the thickness direction, with the long side extending in the X direction. The bottom surface 10 may have any shape in plan view, such as another polygonal shape or a circle.

[0018] 3 to 6, the bottom portion 10 includes metal bottom plate members 11 and 12 and rod-shaped bottom reinforcing beams 13. In this embodiment, the bottom reinforcing beams 13 are also made of metal. Specific constituent materials of the metal bottom plate members 11 and 12 and the bottom reinforcing beams 13 may be, for example, iron (Fe), aluminum (Al), an aluminum alloy, or the like.

[0019] In this embodiment, the bottom portion 10 includes two bottom plate members 11 and 12. Each of the two bottom plate members 11 and 12 has a flat plate member main body 14 and a side wall portion 15 extending from the edge of the plate member main body 14 in the thickness direction. The planar shape of the plate member main body 14 as viewed in the thickness direction is the same as the planar shape of the bottom portion 10 described above (i.e., rectangular). The shape and size of the plate member main body 14 as viewed in the thickness direction are substantially the same between the two bottom plate members 11 and 12. In the following description, the surface of the plate member main body 14 that is perpendicular to the thickness direction may be referred to as the main surface of the plate member main body 14 or the bottom plate members 11 and 12.

[0020] The side wall portions 15 extend from each of the four sides of the rectangular plate member body 14 to one side in the thickness direction of the plate member body 14. The length of the side wall portions 15 extending in the thickness direction of the plate member body 14 is sufficiently smaller than the four sides of the plate member body 14. The bottom plate members 11, 12, which are made up of the plate member body 14 and the side wall portions 15, can be formed by bending a metal plate material.

[0021] The two bottom plate members 11, 12 are positioned so that their plate member bodies 14 are aligned in their thickness direction (Z direction) and so that their side wall portions 15 extend toward each other. As shown in Figures 3 and 4 , when the two bottom plate members 11, 12 are stacked, the side wall portions 15 of the two bottom plate members 11, 12 overlap in the direction along the main surfaces 11a, 11b, 12a, and 12b of the plate member bodies 14. The two bottom plate members 11, 12 are fixed to each other by fastening the side wall portions 15 of the two stacked bottom plate members 11, 12 with rivets or the like. In this state, the plate member bodies 14 of the two bottom plate members 11, 12 are positioned at a distance from each other in the Z direction. As a result, the bottom surface portion 10 has a space S surrounded by the plate member bodies 14 and side wall portions 15 of the two bottom surface plate members 11 and 12.

[0022] 3 to 6, the bottom reinforcing beam 13 is a rod-shaped member that is fixed to the main surfaces 11a, 11b, 12a, and 12b of the bottom plate members 11 and 12 and extends along the main surfaces 11a, 11b, 12a, and 12b of the bottom plate members 11 and 12. The bottom reinforcing beam 13 is disposed between the two bottom plate members 11 and 12 and is fixed to each of the main surfaces 11a and 12a of the two bottom plate members 11 and 12 that face each other.

[0023] The bottom reinforcing beams 13 extend linearly along the main surfaces 11a, 12a of the bottom plate members 11, 12. The bottom reinforcing beams 13 extend in a direction along the long sides of the bottom plate members 11, 12 (long side direction: X direction in Figures 3 and 5). Here, the dimension of the bottom reinforcing beams 13 in the extension direction is equal to the long sides of the bottom plate members 11, 12. Therefore, the bottom reinforcing beams 13 extend over the entire long side direction of the bottom plate members 11, 12. In addition, the bottom reinforcing beams 13 are located midway in the short side direction (Y direction in Figure 3) of the bottom plate members 11, 12.

[0024] 5 and 6, the bottom reinforcing beam 13 of this embodiment is formed by bending a metal plate material. A bend line 13F in the bottom reinforcing beam 13 extends in the extension direction of the bottom reinforcing beam 13. Specifically, the bottom reinforcing beam 13 is formed by bending a band-shaped metal plate material, and has one first band plate portion 131, two second band plate portions 132, and two connecting band plate portions 133 that extend in the extension direction of the metal plate material.

[0025] The two second band plate portions 132 are positioned on both sides of the first band plate portion 131 in the width direction (Y direction), offset from the first band plate portion 131 in its thickness direction (Z direction). The thickness directions of the first band plate portion 131 and the second band plate portion 132 are oriented in the same direction. That is, the first band plate portion 131 and the second band plate portion 132 are parallel to each other. The two connecting band plate portions 133 extend in the thickness directions of the first band plate portion 131 and the second band plate portion 132, respectively, and connect the first band plate portion 131 to the two second band plate portions 132. The fold lines 13F of the bottom reinforcing beam 13 are formed between the first band plate portion 131 and the connecting band plate portion 133, and between the connecting band plate portion 133 and the second band plate portion 132.

[0026] As shown in FIGS. 3 and 10 , the bottom surface portion 10 of this embodiment further includes a plurality of mounting blocks 17 for attaching legs 18 (see FIGS. 1 and 2 ) to the underside of the bottom surface portion 10. Although not shown, each mounting block 17 has a female threaded hole for screwing the leg 18 to the mounting block 17. In this embodiment, there are four mounting blocks 17, which are arranged at the four corners of the bottom surface portion 10, which has a rectangular shape in a plan view. The mounting blocks 17 are fixed to the main surfaces of the bottom surface plate members 11 and 12 by screws or the like. In this embodiment, the mounting blocks 17 are arranged between the two bottom surface plate members 11 and 12 (plate member main bodies 14) and are fixed to both of the two bottom surface plate members 11 and 12.

[0027] As shown in Figures 3 and 4, the bottom surface portion 10 is disposed so that its thickness direction faces the Z direction and its long side faces the X direction. The two bottom surface plate members 11, 12 constituting the bottom surface portion 10 include a first bottom surface plate member 11 located on the lower side (-Z side) and a second bottom surface plate member 12 located on the upper side (+Z side). The first bottom surface plate member 11 constitutes the outer surface of the bottom surface portion 10 facing the outside of the housing 2, and the second bottom surface plate member 12 constitutes the inner surface of the bottom surface portion 10 facing the inside of the housing 2. The main surface 11a of the first bottom surface plate member 11 facing upward and the main surface 12a of the second bottom surface plate member 12 facing downward are both inner surfaces 11a, 12a of the bottom surface portion 10 facing the space side. In addition, the main surface 11b of the first bottom plate member 11 facing downward and the main surface 12b of the second bottom plate member 12 facing upward are both outer surfaces 11b, 12b facing outward from the bottom portion 10.

[0028] Next, an example of a method for assembling the bottom portion 10 of this embodiment will be described, mainly with reference to Figures 7 to 9. When assembling the bottom portion 10, first, as shown in Figure 7, a bottom reinforcing beam 13 is placed on the inner surface 11a (main surface 11a) facing upward of the first bottom plate member 11. Two second band portions 132 of the bottom reinforcing beam 13 overlap the inner surface 11a of the first bottom plate member 11. In this state, the bottom reinforcing beam 13 extends in the long side direction (X direction) of the first bottom plate member 11, midway along the short side direction (Y direction) of the first bottom plate member 11. Then, the two second band portions 132 of the bottom reinforcing beam 13 are fixed to the first bottom plate member 11 from the underside of the first bottom plate member 11 using first rivets 191. Each second band plate portion 132 is fixed to the first bottom plate member 11 by first rivets 191 at a plurality of locations spaced apart in the extension direction.

[0029] Next, as shown in Figures 8 and 4, the second bottom plate member 12 is placed on top of the first bottom plate member 11 and the bottom reinforcing beam 13. In this state, the inner surface 12a of the second bottom plate member 12 facing downward faces the inner surface 11a of the first bottom plate member 11 via the bottom reinforcing beam 13. The side wall portions 15 of the first bottom plate member 11 and the second bottom plate member 12 overlap each other in the thickness direction. Furthermore, the first band portion 131 of the bottom reinforcing beam 13 overlaps the inner surface 12a of the second bottom plate member 12. Then, the first band portion 131 of the bottom reinforcing beam 13 is fixed to the second bottom plate member 12 from the upper side of the second bottom plate member 12 by second rivets 192. The first band portion 131 is fixed to the second bottom plate member 12 by the second rivets 192 at multiple locations spaced apart in its extension direction.

[0030] 9, the side wall portions 15 of the overlapping first and second bottom plate members 11, 12 are fastened from the outside with third rivets 193, thereby completing the method of assembling the bottom portion 10. The side wall portions 15 of the first and second bottom plate members 11, 12 are fastened to each other with the third rivets 193 at multiple locations spaced apart in the long and short side directions of the bottom plate members 11, 12.

[0031] 10 to 12, the projection units 6 to 8 are disposed on the inner surface of the bottom portion 10 (the outer surface 12b of the second bottom plate member 12) facing inward of the housing 2. In this state, the projection units 6 to 8 straddle the bottom reinforcing beam 13 in the orthogonal direction (Y direction) perpendicular to the extension direction (X direction) of the bottom reinforcing beam 13. Furthermore, the projection units 6 to 8 are fixed to the second bottom plate member 12 on both sides of the bottom reinforcing beam 13.

[0032] In this embodiment, the projection units 6 to 8 are fixed to the second bottom plate member 12 by fixing screws 9. The fixing screws 9 fix both ends of the projection units 6 to 8 in the Y direction to the second bottom plate member 12. The fixing screws 9 also fix both ends of the projection units 6 to 8 in the X direction to the second bottom plate member 12. This allows almost the entire area of ​​the outer surface 12b of the second bottom plate member 12 that overlaps with the projection units 6 to 8 to be fixed to the projection units 6 to 8.

[0033] As described above, the projection units 6 to 8 in this embodiment include the light source unit 6, the optical unit 7, and the power supply unit 8. In the illustrated example, the light source unit 6, the optical unit 7, and the power supply unit 8 are arranged in this order from the left end of the bottom surface portion 10 to the right side, but this is not limiting.

[0034] As shown in Figure 2, the frame 20 is provided on the upper side of the bottom surface portion 10. The frame 20 is formed by combining a plurality of rod-shaped members. Specifically, the frame 20 is formed by a plurality of support columns 21 and upper beams 22 to 25, each of which is formed in a rod shape. The plurality of support columns 21 each extend upward (in the +Z direction) from the bottom surface portion 10. The plurality of upper beams 22 to 25 each extend between the upper ends of adjacent support columns 21.

[0035] In this embodiment, four pillars 21 extend upward from the four corners of the bottom surface portion 10, which is rectangular in plan view. The four upper beams 22 to 25 include a front upper beam 22, a rear upper beam 23, a left upper beam 24, and a right upper beam 25. The front upper beam 22 extends in the X direction between the upper ends of pillars 21 adjacent in the X direction on the front side (-Y side). The rear upper beam 23 extends in the X direction between the upper ends of pillars 21 adjacent in the X direction on the rear side (+Y side). The left upper beam 24 extends in the Y direction between the upper ends of pillars 21 adjacent in the Y direction on the left side (+X side). The right upper beam 25 extends in the Y direction between the upper ends of pillars 21 adjacent in the Y direction on the right side (-X side). These four upper beams 22 to 25 are arranged to form a rectangular shape in plan view corresponding to the bottom surface portion 10 .

[0036] In this specification, the above-mentioned upper beams 22 to 25 also function as side reinforcing beams 22 to 25, which are components of the side portion 40 described later.

[0037] 1 and 2 , the side surface portions 40 extend upward (in the +Z direction) from the edges of the bottom surface portion 10 to form the surfaces of the housing 2. The housing 2 of this embodiment has four side surface portions 40. The four side surface portions 40 include a front surface portion 40C, a rear surface portion 40D, a left surface portion 40E, and a right surface portion 40F.

[0038] As shown in FIGS. 13 to 16, each side surface portion 40 includes a metal side surface plate member 41 and side surface reinforcing beams 22 to 25, 42.

[0039] The side plate member 41 of this embodiment is formed in a flat plate shape. The side plate member 41 is formed in a rectangular shape (rectangular shape) when viewed from a plane in the thickness direction. The short sides of the rectangular side plate member 41 extend in the Z direction, and the two long sides of the side plate member 41 are aligned in the Z direction.

[0040] As shown in Figures 1 and 2, the edge portions of the side plate members 41 of each side portion 40 are fixed by screws or the like to a linearly extending edge (long side or short side) of the bottom portion 10, two support columns 21 extending from both ends of the edge of the bottom portion 10, and upper beams 22 to 25 extending between the upper ends of these two support columns 21. As a result, the side plate members 41 cover the area surrounded by the linear edges of the bottom portion 10, the two support columns 21, and the upper beams 22 to 25. Specifically, of the two long sides of the side plate members 41, a first long side 411a (first side) located on the lower side is fixed to the linearly extending edge (long side or short side) of the bottom portion 10. The two short sides of the side plate members 41 are fixed to the two support columns 21. A second long side 411b (second side) located on the upper side of the side plate member 41 and parallel to the first long side 411a is fixed to the upper beams 22 to 25.

[0041] As shown in Figures 2 and 13 to 16, the side reinforcing beams 22 to 25, 42 are rod-shaped members fixed to the main surface 41a of the side surface plate member 41 and extending along the main surface 41a of the side surface plate member 41. The side surface reinforcing beams 22 to 25, 42 are formed by bending metal plate material. The bending curves of the side surface reinforcing beams 22 to 25, 42 extend in the extension direction of the side surface reinforcing beams 22 to 25, 42. The side surface reinforcing beams 22 to 25, 42 include first side surface reinforcing beams 22 to 25 and second side surface reinforcing beam 42. The first side surface reinforcing beams 22 to 25 are the upper end beams 22 to 25 of the frame 20 described above, and are fixed to the second long side 411b of the main surface 41a of the side surface plate member 41. In this state, the first side surface reinforcing beams 22 to 25 extend along the second long side 411b of the side surface plate member 41. The second side surface reinforcing beam 42 is a separate member that does not constitute the frame 20.

[0042] Below, specific examples of the side surface portion 40, that is, the front surface portion 40C, the rear surface portion 40D, the left surface portion 40E, and the right surface portion 40F will be described.

[0043] As shown in FIG. 2 , the front surface 40C constitutes the front surface of the housing 2. The side plate member 41 of the front surface 40C (hereinafter referred to as the front surface plate member 41C) is formed in a rectangular shape in a plan view, with its short side in the Z direction and its long side in the X direction. The front surface plate member 41C has an opening 44C for passing the projection lens 3 (see FIG. 1 ). A first long side 411a (first side) located on the lower side of the front surface plate member 41C is fixed to the long side of the bottom surface portion 10 located on the front side. The two short sides of the front surface plate member 41C are fixed to two support columns 21 adjacent in the X direction on the front side of the bottom surface portion 10. A second long side 411b (second side) located on the upper side of the front surface plate member 41C is fixed to the front upper end beam 22 (first side reinforcing beam 22) extending in the X direction.

[0044] 13 , a front reinforcing beam 42C, which is the second side surface reinforcing beam 42, is also fixed to the inner surface 41a (main surface 41a) of the front plate member 41C facing the inside of the housing 2. The front reinforcing beam 42C is fixed to two short sides of the inner surface 41a (main surface 41a) of the front plate member 41C, and extends in the Z direction along the short sides.

[0045] As shown in FIG. 2 , the rear panel 40D constitutes the rear surface of the housing 2. The side panel 41 (hereinafter referred to as the rear panel 41D) of the rear panel 40D is rectangular in plan view, with its short side in the Z direction and its long side in the X direction. An opening 44D is formed through the rear panel 41D. A first long side 411a (first side) located on the lower side of the rear panel 41D is fixed to the long side of the bottom panel 10 located on the rear side. The two short sides of the rear panel 41D are fixed to two support columns 21 adjacent in the X direction on the rear side of the bottom panel 10. A second long side 411b (second side) located on the upper side of the rear panel 41D is fixed to the rear upper beam 23 (first side reinforcing beam 23) extending in the X direction.

[0046] 14 , a rear reinforcing beam 42D, which is the second side surface reinforcing beam 42, is also fixed to the inner surface 41a (main surface 41a) of the rear plate member 41D facing the inside of the housing 2. The rear reinforcing beam 42D is fixed to the inner surface 41a (main surface 41a) of the rear plate member 41D and extends along the inner surface 41a. The rear reinforcing beam 42D in the illustrated example includes one that surrounds the edge of the opening 44D of the rear plate member 41D and one that extends linearly in the Z direction.

[0047] As shown in FIG. 2 , the left surface 40E constitutes the left surface of the housing 2. The side surface plate member 41 of the left surface portion 40E (hereinafter referred to as the left surface plate member 41E) is formed in a rectangular shape in a plan view, with its short side in the Z direction and its long side in the Y direction. The left surface plate member 41E has an opening 44E formed therethrough. A first long side 411a (first side) located on the lower side of the left surface plate member 41E is fixed to a short side of the bottom surface portion 10 located on the left side. The two short sides of the left surface plate member 41E are fixed to two support columns 21 adjacent in the Y direction on the left side of the bottom surface portion 10. A second long side 411b (second side) located on the upper side of the left surface plate member 41E is fixed to a left upper end beam 24 (first side reinforcing beam 24) extending in the Y direction.

[0048] 15 , a left surface reinforcing beam 42E, which is the second side surface reinforcing beam 42, is also fixed to the inner surface 41a (main surface 41a) of the left surface plate member 41E facing inward of the housing 2. The left surface reinforcing beam 42E is fixed to the inner surface 41a (main surface 41a) of the left surface plate member 41E and extends along the inner surface 41a. The left surface reinforcing beam 42E in the illustrated example includes one that surrounds the edge of the opening 44E of the left surface plate member 41E and one that extends linearly in the Z direction.

[0049] As shown in FIG. 2 , the right surface portion 40F constitutes the right surface of the housing 2. The side surface plate member 41 of the right surface portion 40F (hereinafter referred to as the right surface plate member 41F) is formed in a rectangular shape in a plan view, with its short side in the Z direction and its long side in the Y direction. A first long side 411a (first side) located on the lower side of the right surface plate member 41F is fixed to a short side of the bottom surface portion 10 located on the right side. The two short sides of the right surface plate member 41F are fixed to two support columns 21 adjacent in the Y direction on the right side of the bottom surface portion 10. A second long side 411b (second side) located on the upper side of the right surface plate member 41F is fixed to a right upper end beam 25 (first side surface reinforcing beam 25) extending in the Y direction.

[0050] 16 , a right surface reinforcing beam 42F, which is the second side surface reinforcing beam 42, is also fixed to the inner surface 41 a (main surface 41 a) of the right surface plate member 41F facing the inside of the housing 2. The right surface reinforcing beam 42F is fixed to two short sides of the front surface plate member 41C on the inner surface 41 a (main surface 41 a) of the right surface plate member 41F, and extends in the Z direction along the short sides.

[0051] In the side surface portion 40 described above, the second side surface reinforcing beam 42 may be fixed to, for example, the outer surface (main surface) of the side surface plate member 41 facing outward from the housing 2 .

[0052] As shown in Figures 1 and 2, the top surface 30 of the housing 2 constitutes the upper surface of the housing 2. The top surface 30 includes a metal top surface plate member 31 and a top surface reinforcing beam 32. The top surface plate member 31 is formed in a generally flat plate shape, with its thickness direction facing the Z direction. The top surface plate member 31 also faces the bottom surface 10 in the Z direction. The planar shape of the top surface plate member 31 as viewed from the thickness direction corresponds to the planar shape of the bottom surface 10. In other words, the planar shape of the top surface plate member 31 is formed in a rectangular shape with its long sides extending in the X direction.

[0053] The top surface reinforcing beam 32 is a rod-shaped member fixed to the inner surface 31a (main surface 31a) of the top surface plate member 31 facing inward of the housing 2 and extending along the inner surface 31a of the top surface plate member 31. The top surface reinforcing beam 32 extends in a direction along the long side of the top surface plate member 31 (long side direction: X direction in FIG. 2 ). Here, the dimension of the top surface reinforcing beam 32 in the extension direction is equal to the long side of the top surface plate member 31. Therefore, the top surface reinforcing beam 32 extends over the entire long side direction of the top surface plate member 31. Furthermore, the top surface reinforcing beam 32 is located midway in the short side direction (Y direction in FIG. 2 ) of the top surface plate member 31. The top surface reinforcing beam 32 may be fixed to, for example, the outer surface (main surface) of the top surface plate member 31 facing outward of the housing 2.

[0054] The top surface portion 30 is fixed to the four upper beams 22 to 25 of the frame 20 by screws or the like. Specifically, the two long sides of the top surface plate member 31 are fixed to the front upper beam 22 and the rear upper beam 23, and the two short sides of the top surface plate member 31 are fixed to the left upper beam 24 and the right upper beam 25.

[0055] As shown in FIGS. 1 and 2 , in the housing 2 of this embodiment, the adjacent front surface 40C and the left and right surfaces 40E and 40F are spaced apart, and the adjacent rear surface 40D and the left and right surfaces 40E and 40F are spaced apart. Therefore, the housing 2 of this embodiment further includes four support column cover members 50. The four support column cover members 50 are disposed in the gaps between the adjacent front surface 40C and the left and right surfaces 40E and 40F, and in the gaps between the adjacent rear surface 40D and the left and right surfaces 40E and 40F, respectively, to cover the support columns 21 from the outside of the frame 20. The support column cover members 50 in this embodiment are made of resin, but may also be made of metal, for example.

[0056] As described above, in the projection display device 1 of this embodiment, the bottom portion 10 of the housing 2 includes metal bottom plate members 11, 12 and rod-shaped bottom reinforcing beams 13 fixed to the main surfaces 11 a, 12 a of the bottom plate members 11, 12 and extending along the main surfaces 11 a, 12 a of the bottom plate members 11, 12. As a result, the bottom reinforcing beams 13 suppress flexural deformation of the metal bottom plate members 11, 12. The bottom reinforcing beams 13 particularly suppress flexural deformation of the bottom plate members 11, 12 in the extension direction (X direction) of the bottom reinforcing beams 13. As a result, flexural deformation of the panel that constitutes the bottom portion 10 of the housing 2 can be suppressed.

[0057] Furthermore, in the projection display device 1 of this embodiment, the bottom reinforcing beam 13 is disposed between the two bottom plate members 11, 12. Therefore, the bottom reinforcing beam 13 is not exposed to the inside or outside of the housing 2. This allows the inner and outer surfaces of the bottom portion 10 of the housing 2, which is formed by the main surfaces 11b, 12b of the bottom plate members 11, 12, to be formed flat. Furthermore, the bottom reinforcing beam 13 is fixed to both of the two bottom plate members 11, 12. This allows the bending stress acting on the bottom reinforcing beam 13 to be released to the two bottom plate members 11, 12. Therefore, bending deformation of the panel that forms the bottom portion 10 of the housing 2 can be more effectively suppressed.

[0058] Furthermore, in the projection display device 1 of this embodiment, the bottom plate members 11, 12 are rectangular in plan view. Therefore, the bottom plate members 11, 12 are prone to flexural deformation in their long side direction (X direction). In contrast, the bottom reinforcing beams 13 fixed to the bottom plate members 11, 12 extend along the long sides of the bottom plate members 11, 12. This makes it possible to suppress flexural deformation of the bottom plate members 11, 12 in the long side direction (X direction) of the bottom plate members 11, 12. Therefore, flexural deformation of the panel that constitutes the bottom portion 10 of the housing 2 can be effectively suppressed.

[0059] Furthermore, in the projection display device 1 of this embodiment, the projection units 6-8 housed inside the housing 2 have higher rigidity than the bottom plate members 11 and 12. The projection units 6-8 are arranged on the inner surface of the bottom portion 10 so as to straddle the bottom reinforcing beam 13 in the orthogonal direction (Y direction) perpendicular to the extension direction (X direction) of the bottom reinforcing beam 13. The projection units 6-8 are also fixed to the bottom plate members 11 and 12 on both sides of the bottom reinforcing beam 13. This makes it possible to suppress not only the flexural deformation of the bottom plate members 11 and 12 in the extension direction (X direction) of the bottom reinforcing beam 13, but also the flexural deformation of the bottom plate members 11 and 12 in the orthogonal direction (Y direction) (deformation in the direction indicated by arrow D1 in FIG. 11 ). This makes it possible to prevent flexural deformation of the panel that constitutes the bottom portion 10 of the housing 2.

[0060] In the projection display device 1 of this embodiment, the bottom reinforcing beams 13 are formed by bending a metal plate material. The bend lines 13F in the bottom reinforcing beams 13 extend in the extension direction of the bottom reinforcing beams 13. This makes the bottom reinforcing beams 13 highly rigid and resistant to bending deformation in the extension direction. Therefore, the bottom reinforcing beams 13 can effectively suppress bending deformation of the metal bottom plate members 11, 12.

[0061] Furthermore, in the projection display device 1 of this embodiment, the side surface 40 of the housing 2 includes a metal side surface plate member 41 and rod-shaped side surface reinforcing beams 22-25, 42 that are fixed to the main surface 41a of the side surface plate member 41 and extend along the main surface 41a of the side surface plate member 41. Therefore, the side surface reinforcing beams 22-25, 42 suppress flexural deformation of the metal side surface plate member 41. The side surface reinforcing beams 22-25, 42 particularly suppress flexural deformation of the side surface plate member 41 in the extension direction of the side surface reinforcing beams 22-25, 42. Therefore, flexural deformation of the panel that constitutes the side surface portion 40 of the housing 2 can be suppressed.

[0062] Furthermore, in the projection display device 1 of this embodiment, the side plate member 41 has a rectangular shape in a plan view. Therefore, the side plate member 41 is prone to flexural deformation in the direction of its long side. In contrast, the first side reinforcing beams 22 to 25 fixed to the side plate member 41 extend along the long side of the side plate member 41. This makes it possible to suppress flexural deformation of the side plate member 41 in the direction of its long side. Therefore, it is possible to effectively suppress flexural deformation of the panel that constitutes the side portion 40 of the housing 2.

[0063] Furthermore, in the projection display device 1 of this embodiment, the first long side 411a (first side) of the side plate member 41 is fixed to the edge of the bottom surface portion 10, and the second long side 411b (second side) of the side plate member 41 is fixed to the first side reinforcing beams 22 to 25. This improves the rigidity of the first long side 411a and the second long side 411b of the side plate member 41, which is formed in a rectangular shape in a plan view. This effectively suppresses flexural deformation of the side plate member 41 in the long side direction of the side plate member 41. This therefore further suppresses flexural deformation of the panel that constitutes the side surface portion 40 of the housing 2.

[0064] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention.

[0065] In the present invention, the bottom reinforcing beam 13 and the side reinforcing beams 22 to 25, 42 may be made of, for example, resin.

[0066] In the present invention, the bottom portion 10 of the housing 2 may be configured, for example, by one bottom plate member and a bottom reinforcing beam 13. In this case, the bottom plate member may be formed, for example, in a flat plate shape. Furthermore, the bottom reinforcing beam 13 may be fixed to the main surface of the bottom plate member that forms the inner or outer surface of the bottom portion 10.

[0067] In the present invention, the bottom surface portion 10 may include, for example, two bottom surface plate members 11, 12 and may not include the bottom surface reinforcing beam 13. That is, the bottom surface portion 10 may be configured, for example, by stacking two metal bottom surface plate members 11, 12 in the thickness direction. Furthermore, the two bottom surface plate members 11, 12 may each be configured only with a flat plate-shaped plate member main body 14. That is, the bottom surface portion 10 may be configured by stacking two flat bottom surface plate members 11, 12 in the thickness direction. Even with this configuration, the strength of the bottom surface portion 10 can be improved compared to when the bottom surface portion 10 is configured with a single bottom surface plate member. Therefore, flexural deformation of the panel that constitutes the bottom surface portion 10 of the housing 2 can be suppressed. Additionally, the provision of the bottom surface reinforcing beam 13 can further suppress flexural deformation.

[0068] In the present invention, the side surface portion 40 of the housing 2 may be, for example, a cylindrical peripheral wall portion extending upward from the bottom surface portion 10 .

[0069] 1 Projection type display device 2 Housing 6 to 8 Projection unit 10 Bottom part 11 First bottom plate member 11a, 11b Main surface 12 Second bottom plate member 12a, 12b Main surface 13 Bottom reinforcement beam 13F Folding curve 22 Front upper end beam (side reinforcement beam) 23 Rear upper end beam (side reinforcement beam) 24 Left upper end beam (side reinforcement beam) 25 Right upper end beam (side reinforcement beam) 40 Side part 41 Side plate member 41a Main surface 42 Second side reinforcement beam (side reinforcement beam) 411a First long side (first side) 411b Second long side (second side)

Claims

1. A projection display device in which the bottom portion of the housing comprises a metal bottom plate member and a rod-shaped bottom reinforcing beam fixed to the main surface of the bottom plate member and extending along the main surface of the bottom plate member.

2. A projection display device according to claim 1, wherein the bottom portion comprises two of the bottom plate members, and the bottom reinforcing beam is disposed between the two bottom plate members.

3. A projection display device as described in claim 1 or claim 2, wherein the bottom plate member is formed in a rectangular shape when viewed in a plan view from its thickness direction, and the bottom reinforcing beams extend along the long sides of the bottom plate member.

4. A projection display device as described in claim 1 or claim 2, comprising a projection unit housed inside the housing for projecting image light to the outside, the projection unit being arranged on the inner surface of the bottom portion so as to straddle the bottom reinforcement beam in a direction perpendicular to the extension direction of the bottom reinforcement beam along the main surface of the bottom plate member, and being fixed to the bottom plate member on both sides of the bottom reinforcement beam.

5. A projection display device according to claim 1 or claim 2, wherein the bottom reinforcing beam is formed by bending a metal plate, and the bending curve of the bottom reinforcing beam extends in the extension direction of the bottom reinforcing beam.

6. A projection display device in which the bottom surface of the housing is formed by stacking two metal bottom plate members in the thickness direction.

7. A projection display device as described in claim 1 or claim 6, wherein the side portion that extends upward from the edge of the bottom portion and constitutes the housing comprises a metal side plate member and a rod-shaped side reinforcing beam that is fixed to the main surface of the side plate member and extends along the main surface of the side plate member.

8. A projection display device according to claim 7, wherein the side plate member is formed in a rectangular shape when viewed in a plan view from the thickness direction, and the side reinforcing beam extends along the long side of the side plate member.

9. A projection display device as described in claim 7, wherein the side plate member is formed in a rectangular shape when viewed in a plan view from its thickness direction, a first side of the side plate member is fixed to an edge of the bottom surface portion, and the side reinforcing beam is fixed to a second side of the side plate member that is parallel to the first side and extends along the second side.

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