Projection-type display device and method for assembling housing

Abstract

A housing of this projection-type display device includes: bottom plate members (11, 12); a plurality of connection blocks (13) fixed to a main surface of the bottom plate members, and arranged at intervals along the edge of the bottom plate members; and a plurality of support columns (20) fixed to the connection blocks and extending upward from the edges of the bottom plate members.

Description

Projection display device and housing assembly method

[0001] The present invention relates to a projection display device and a method for assembling a housing.

[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 such projection display devices, when they are small and manufactured in large quantities, the components of the housing are often manufactured using molds. However, when the projection display device is large, it is difficult to manufacture the larger components of the housing (such as the bottom plate member) using molds. Furthermore, when the number of projection display devices manufactured is small, using molds to manufacture the components of the housing is undesirable in terms of manufacturing costs.

[0005] For this reason, when a projection display device is large or when the number of projection display devices to be manufactured is small, the components of the housing (for example, the bottom plate member) may be manufactured using various processes such as bending and drilling without using a mold. However, the components of the housing manufactured in this way will have variations in the dimensions of the parts, the positions of the bends and holes, etc. This results in the problem of large assembly tolerances for the housing.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a projection display device and a method for assembling a housing that allows the housing to be assembled while keeping assembly tolerances small.

[0007] A first aspect of the present invention is a projection display device whose housing comprises a bottom plate member, a plurality of connection blocks each fixed to a main surface of the bottom plate member and arranged at intervals along the edge of the bottom plate member, and a plurality of supports each fixed to the connection blocks and extending upward from the edge of the bottom plate member.

[0008] A second aspect of the present invention is a method for assembling a housing for use in a projection display device, which includes placing a plurality of connection blocks on the placement surface of a positioning jig, positioning at least two of the plurality of connection blocks relative to one another, attaching the plurality of connection blocks placed on the placement surface to a bottom plate member, and fixing the two relatively positioned connection blocks to the bottom plate member, and then individually fixing a plurality of the support pillars to the plurality of connection blocks.

[0009] According to the present invention, the housing that constitutes the projection display device can be assembled with small assembly tolerances.

[0010] 1 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 panel, rear panel, left panel, right panel, top panel, and support column cover members of the housing removed from the bottom portion of the housing, the plurality of support columns, and the plurality of upper beams. It is a perspective view showing the bottom portion of the housing and the plurality of support columns attached to the bottom portion in the projection display device of FIGS. 1 and 2. It is an exploded perspective view showing the bottom portion of FIG. 3 disassembled into two bottom plate members and four connection blocks. It is a plan view showing an enlarged view of four corners of the bottom plate member of FIG. 4. It is a perspective view showing an enlarged view of the connection blocks of FIG. 4. It is a perspective view showing the process of attaching the plurality of connection blocks to the bottom plate member in a method of assembling a housing according to an embodiment of the present invention. It is a perspective view showing the process of attaching the connection blocks subsequent to FIG. 7. It is a plan view schematically showing the state in FIG. 8. It is an exploded perspective view showing the state in which the support column of FIG. 3 is disassembled into a support column main body and an upper end block. It is a perspective view showing the support column main body of FIG. 12. FIG. 13 is a perspective view showing a process of attaching a plurality of support columns to a bottom portion in a method for assembling a housing according to an embodiment of the present invention. FIG. 14 is a perspective view showing a process of fixing the support columns to a connection block in the process of attaching the support columns in the method for assembling a housing according to an embodiment of the present invention. FIG. 15 is a perspective view showing a process of attaching an upper beam to the upper ends of the support columns in a method for assembling a housing according to an embodiment of the present invention. FIG. 16 is an enlarged perspective view showing a manner in which a front upper beam is attached to the support columns. FIG. 17 is an enlarged perspective view showing a manner in which a left upper beam is attached to the support columns.

[0011] 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.

[0012] 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."

[0013] 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."

[0014] 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.

[0015] 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.

[0016] 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 are arranged on a bottom surface 10 of the housing 2, which will be described later. 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. 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.

[0017] The housing 2 comprises a bottom portion 10, a plurality of support columns 20, a plurality of upper beams 31 to 34, side panels 40, and a top panel 50.

[0018] The bottom surface 10 constitutes the lower surface of the housing 2. As shown in FIG. 3 , the bottom surface 10 is formed in a generally flat plate shape. The thickness direction of the bottom surface 10 faces the Z direction. When viewed from the thickness direction, the bottom surface 10 has a rectangular shape with its longer side extending in the X direction. The shape of the bottom surface 10 when viewed from the thickness direction may be any shape, such as another polygonal shape or a circle.

[0019] 3 and 4 , the bottom surface portion 10 includes bottom plate members 11 and 12 and a plurality of connection blocks 13. In this embodiment, the bottom plate members 11 and 12 and the connection blocks 13 are made of metal. Specific constituent materials of the metal bottom plate members 11 and 12 and the connection blocks 13 may be, for example, iron (Fe), aluminum (Al), an aluminum alloy, or the like.

[0020] In this embodiment, the bottom surface portion 10 includes two bottom plate members 11 and 12. Each of the two bottom plate members 11 and 12 is made of a metal plate and includes 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 surface 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.

[0021] 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.

[0022] 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 FIG. 3 , 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.

[0023] As shown in Figures 3 and 4, the two bottom plate members 11, 12 include a first bottom plate member 11 located on the lower side (-Z side) and a second bottom plate member 12 located on the upper side (+Z side). The first bottom plate member 11 forms the outer surface of the bottom surface portion 10 facing outward from the housing 2, and the second bottom plate member 12 forms the inner surface of the bottom surface portion 10 facing inward from the housing 2. The main surface 11a of the first bottom plate member 11 facing upward and the main surface 12a of the second bottom plate member 12 facing downward are both inner surfaces 11a, 12a facing inward from the bottom surface portion 10. 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 surface portion 10.

[0024] The multiple connection blocks 13 are fixed to the main surfaces 11a, 12a of the bottom plate members 11, 12, respectively, and are arranged at intervals along the edges of the bottom plate members 11, 12. The connection blocks 13 are arranged at each of the four corners 14C, 14D, 14E, and 14F of the plate member body 14 of the bottom plate members 11, 12, which is rectangular in plan view. Specifically, a first connection block 13C is arranged at the first corner 14C of the plate member body 14, which is located on the right side (-X side) and the front side (-Y side). A second connection block 13D is arranged at the second corner 14D of the plate member body 14, which is located on the left side (+X side) and the front side (-Y side). A third connection block 13E is arranged at the third corner 14E of the plate member body 14, which is located on the right side (-X side) and the rear side (+Y side). A fourth connection block 13F is disposed at a fourth corner 14F of the plate member body 14 located on the left side (+X side) and rear side (+Y side). Each connection block 13 is fixed to the plate member body 14 of each bottom plate member 11, 12 with screws (not shown). As a result, the connection block 13 is sandwiched between the plate member bodies 14 of the two bottom plate members 11, 12 in the Z direction.

[0025] As shown in FIG. 6 , each connection block 13 has a block body 131 and a protrusion 132 .

[0026] The block body 131 is overlapped and fixed to the inner surfaces 11a, 12a (see FIG. 4) of the plate member bodies 14 of the two bottom plate members 11, 12 that face each other in the Z direction. The block body 131 has two end surfaces 131a, 131b that face upward and downward, perpendicular to the Z direction. These two end surfaces 131a, 131b are in surface contact with the inner surfaces 11a, 12a of the bottom plate members 11, 12 when the block body 131 is overlapped on the inner surfaces 11a, 12a.

[0027] The block body 131 also has two contact surfaces 131c and 131d. The two contact surfaces 131c and 131d are surfaces that extend in the Z direction between the two end surfaces 131a and 131b. The two contact surfaces 131c and 131d face in different directions. In this embodiment, the two contact surfaces 131c and 131d are perpendicular to each other when viewed in the Z direction. A support 20 (see FIG. 13), which will be described later, comes into surface contact with these two contact surfaces 131c and 131d.

[0028] The protrusion 132 protrudes from the block body 131 in a direction along the end faces 131a, 131b thereof, i.e., in a direction along the inner surfaces 11a, 12a (main surfaces) of the two bottom plate members 11, 12. In this embodiment, the protrusion 132 protrudes from a portion of the block body 131 between the two contact surfaces 131c, 131d. The protrusion 132 has a flat surface 132a that faces upward and is perpendicular to the Z direction.

[0029] The connection block 13 has a first female threaded hole 133, a second female threaded hole 134, and a third female threaded hole 135. The first female threaded hole 133 is a circular female threaded hole into which a screw (not shown) is threaded to fix the connection block 13 to the bottom plate members 11, 12. The first female threaded holes 133 open to each end face 131 a, 131 b of the block main body 131. In this embodiment, a plurality of first female threaded holes 133 (three in the illustrated example) are provided on each end face 131 a, 131 b of the block main body 131.

[0030] The second female threaded hole 134 is a circular female threaded hole for attaching the leg 18 (see FIG. 3) to the underside of the bottom surface portion 10. The second female threaded hole 134 penetrates the block body 131 in the Z direction and opens to two end faces 131a, 131b of the block body 131. The male threaded portion 181 (see FIG. 3) of the leg 18 is screwed into the second female threaded hole 134. The third female threaded hole 135 is a female threaded hole for fixing the support 20 (described later) to the connection block 13 with a screw 91 (see FIG. 13). The third female threaded hole 135 opens to each of the contact surfaces 131c, 131d of the block body 131.

[0031] As shown in Figures 8 and 9, when each connection block 13 is attached to each corner 14C, 14D, 14E, 14F of the bottom plate members 11, 12, the two contact surfaces 131c, 131d of each connection block 13 are positioned along the long and short sides of the bottom plate members 11, 12, respectively.

[0032] As shown in FIGS. 4 and 5, each of the bottom plate members 11 and 12 has a plurality of fixing insertion holes 141 and a plurality of mounting insertion holes 142 .

[0033] Each fixing through-hole 141 penetrates the plate member body 14 of each bottom plate member 11, 12 in the thickness direction. A screw (not shown) for fixing the connection block 13 to the bottom plate member 11, 12 is inserted through each fixing through-hole 141. In this embodiment, the multiple fixing through-holes 141 are arranged at four corners 14C, 14D, 14E, and 14F of the plate member body 14, which has a rectangular shape in a plan view. The multiple fixing through-holes 141 include a first fixing through-hole 141C, a second fixing through-hole 141D, a third fixing through-hole 141E, and a fourth fixing through-hole 141F, which are located at the four corners 14C, 14D, 14E, and 14F of the plate member body 14, respectively. The first fixing through-hole 141C, the second fixing through-hole 141D, the third fixing through-hole 141E, and the fourth fixing through-hole 141F are arranged in multiple numbers at each of the corners 14C, 14D, 14E, and 14F of the plate member body 14.

[0034] The first fixing through-hole 141C is disposed in a first corner 14C of the plate member main body 14 and corresponds to the first connecting block 13C. The first fixing through-hole 141C is formed in a circular shape with a size equivalent to that of the circular first female threaded hole 133 of the first connecting block 13C (see FIG. 9 ). More precisely, the diameter of the first fixing through-hole 141C is 0.5 mm larger than the diameter of the first female threaded hole 133. Therefore, when a screw is inserted through the first fixing through-hole 141C and screwed into the first female threaded hole 133 of the first connecting block 13C, the first connecting block 13C hardly moves parallel to the plate member main body 14 in directions along its main surface (X direction, Y direction).

[0035] The second fixing through-hole 141D is disposed at a second corner 14D of the plate member main body 14 and corresponds to the second connection block 13D. The second fixing through-hole 141D is adjacent to the first fixing through-hole 141C in the long side direction (X direction) of the plate member main body 14. The second fixing through-hole 141D is formed as an elongated hole extending in the arrangement direction of the first fixing through-holes 141C and the second fixing through-holes 141D (X direction in the illustrated example). The length of the short side of the elongated second fixing through-hole 141D corresponds to the diameter of the circular first female screw hole 133 of the second connection block 13D, and the length of the long side of the second fixing through-hole 141D is longer than the diameter of the first female screw hole 133 (see FIG. 9 ). Therefore, when a screw is inserted through the second fixing through-hole 141D and screwed into the first female threaded hole 133 of the second connection block 13D, the second connection block 13D can move parallel to the X direction relative to the plate member body 14. However, when the second connection block 13D is screwed to the plate member body 14, the second connection block 13D is fixed to the plate member body 14 and does not move relative to the plate member body 14.

[0036] The third fixing through-hole 141E is disposed at a third corner 14E of the plate member main body 14 and corresponds to the third connection block 13E. The third fixing through-hole 141E is adjacent to the first fixing through-hole 141C in the short side direction (Y direction) of the plate member main body 14. The fourth fixing through-hole 141F is disposed at a fourth corner 14F of the plate member main body 14 and corresponds to the fourth connection block 13F. The fourth fixing through-hole 141F is adjacent to the second fixing through-hole 141D in the short side direction (Y direction) of the plate member main body 14.

[0037] The third and fourth fixing through-holes 141E, 141F are formed in a circular shape that is larger than the first female threaded holes 133 of the third and fourth connection blocks 13E, 13F (see FIG. 9 ). The third and fourth fixing through-holes 141E, 141F are also formed larger than the first fixing through-hole 141C. Therefore, when screws are inserted through the third and fourth fixing through-holes 141E, 141F and screwed into the first female threaded holes 133 of the third and fourth connection blocks 13E, 13F, the third and fourth connection blocks 13E, 13F can move parallel to the plate member main body 14 in directions along their main surfaces (X and Y directions). However, when the third and fourth connection blocks 13E, 13F are screwed to the plate member main body 14, the third and fourth connection blocks 13E, 13F are fixed to the plate member main body 14 and do not move relative to the plate member main body 14.

[0038] Each mounting through-hole 142 penetrates the plate member body 14 of each bottom plate member 11, 12 in the thickness direction. Each mounting through-hole 142 receives the male threaded portion 181 (see FIG. 3 ) of the leg portion 18 that is screwed into the second female threaded hole 134 of the connection block 13. In this embodiment, one mounting through-hole 142 is disposed at each of the four corners 14C, 14D, 14E, and 14F of the plate member body 14. The four mounting through-holes 142 include a first mounting through-hole 142C, a second mounting through-hole 142D, a third mounting through-hole 142E, and a fourth mounting through-hole 142F, which are located at the four corners 14C, 14D, 14E, and 14F of the plate member body 14, respectively.

[0039] The first mounting through-hole 142C is disposed in a first corner 14C of the plate member main body 14 and corresponds to the first connecting block 13C. The first mounting through-hole 142C is circular and has the same size as the circular second female threaded hole 134 of the first connecting block 13C. More precisely, the diameter of the first mounting through-hole 142C is 0.5 mm larger than the diameter of the second female threaded hole 134. Therefore, when the male threaded portion 181 of the leg 18 is inserted into the first mounting through-hole 142C and screwed into the second female threaded hole 134 of the first connecting block 13C, the leg 18 and the first connecting block 13C hardly move parallel to each other in directions along the main surface of the plate member main body 14 (X direction, Y direction).

[0040] The second mounting through-hole 142D is disposed at a second corner 14D of the plate member main body 14 and corresponds to the second connecting block 13D. The second mounting through-hole 142D is adjacent to the first mounting through-hole 142C in the long side direction (X direction) of the plate member main body 14. The second mounting through-hole 142D is formed as an elongated hole extending in the arrangement direction of the first mounting through-holes 142C and the second mounting through-holes 142D (X direction in the illustrated example). The length of the short side of the elongated second mounting through-hole 142D corresponds to the diameter of the circular second female threaded hole 134 of the second connecting block 13D, and the length of the long side of the second mounting through-hole 142D is longer than the diameter of the second female threaded hole 134. Therefore, when the male threaded portion 181 of the leg 18 is inserted into the second mounting through-hole 142D and screwed into the second female threaded hole 134 of the second connection block 13D, the leg 18 can move parallel to the X direction together with the second connection block 13D relative to the plate member body 14. However, when the second connection block 13D is screwed to the plate member body 14, the second connection block 13D is fixed to the plate member body 14, and therefore the leg 18 attached to the second connection block 13D does not move relative to the plate member body 14.

[0041] The third mounting through-hole 142E is disposed at a third corner 14E of the plate member main body 14 and corresponds to the third connection block 13E. The third mounting through-hole 142E is adjacent to the first mounting through-hole 142C in the short side direction (Y direction) of the plate member main body 14. The fourth mounting through-hole 142F is disposed at a fourth corner 14F of the plate member main body 14 and corresponds to the fourth connection block 13F. The fourth mounting through-hole 142F is adjacent to the second mounting through-hole 142D in the short side direction (Y direction) of the plate member main body 14.

[0042] The third and fourth mounting through-holes 142E, 142F are formed in a circular shape that is larger than the second female threaded holes 134 of the third and fourth connecting blocks 13E, 13F. The third and fourth mounting through-holes 142E, 142F are also formed larger than the first mounting through-hole 142C. Therefore, when the male threaded portions 181 of the legs 18 are inserted into the third and fourth mounting through-holes 142E, 142F and screwed into the second female threaded holes 134 of the third and fourth connecting blocks 13E, 13F, the legs 18, together with the third and fourth connecting blocks 13E, 13F, can move parallel to the plate member main body 14 in directions along the main surfaces thereof (X and Y directions). However, when the third and fourth connection blocks 13E, 13F are screwed to the plate member main body 14, the third and fourth connection blocks 13E, 13F are fixed to the plate member main body 14, and therefore the legs 18 attached to the third and fourth connection blocks 13E, 13F do not move relative to the plate member main body 14.

[0043] 3, the plurality of support columns 20 are each fixed to the connection block 13 and extend upward from the edges of the bottom plate members 11 and 12. In this embodiment, the support columns 20 extend upward from the four corners 14C, 14D, 14E, and 14F of the bottom surface portion 10. That is, the number of support columns 20 in this embodiment is four.

[0044] As shown in FIG. 13 , the support 20 has an insertion hole 21 and two contact surfaces 22. The insertion hole 21 is a hole into which the protrusion 132 of the connection block 13 is inserted. In the illustrated example, the insertion hole 21 penetrates the support 20, but it does not have to penetrate the support 20, for example. The upper end of the insertion hole 21 extends linearly in a direction perpendicular to the Z direction. In the illustrated example, the insertion hole 21 is rectangular, but this is not limiting. The two contact surfaces 22 both extend in the Z direction but face in different directions. In this embodiment, the two contact surfaces 22 are perpendicular to each other when viewed from the Z direction. When the protrusion 132 is inserted into the insertion hole 21, these two contact surfaces 22 are in surface contact with the two contacted surfaces 131c, 131d of the connection block 13, respectively.

[0045] As shown in FIGS. 10 and 11 , the support column 20 of this embodiment includes a support column body 23 and an upper end block 24 .

[0046] The support body 23 is formed by bending a metal plate. The support body 23 has a first band plate portion 231 extending in the Z direction and two second band plate portions 232 connected to both widthwise sides of the first band plate portion 231 and extending in the Z direction. A fold line extending in the Z direction is located between the first band plate portion 231 and each second band plate portion 232. The two second band plate portions 232 are perpendicular to each other when viewed from the Z direction. The insertion hole 21 of the support 20 described above is located at the lower end of the first band plate portion 231. Furthermore, the two contact surfaces 131c, 131d of the support 20 are formed by the two second band plate portions 232.

[0047] The support main body 23 has a fixing plate 233 located at its upper end for fixing the upper end block 24. The fixing plate 233 is formed contiguous with the upper end of the first band plate 231. The fixing plate 233 is bent relative to the first band plate 231 so that its thickness direction faces the Z direction. The fixing plate 233 has holes formed therein for screwing the upper end block 24. Note that the support main body 23 may not include the fixing plate 233, for example. In this case, the upper end block 24 may be fixed to the first and second band plate portions 231, 232, for example, by screws.

[0048] As shown in Figures 11 and 13, the upper end block 24 is attached to the upper end of the support column main body 23. The upper end block 24 is provided to bridge and attach between the upper ends of two adjacent support columns 20 while positioning the upper end beams 31 to 34 described below. As shown in Figures 14 to 16, the upper end block 24 has a support surface 241 that supports the longitudinal ends of the upper end beams 31 to 34 from below, female threaded holes 245 for fixing the longitudinal ends of the upper end beams 31 to 34 with screws 92, and insertion holes 242 for positioning some of the upper end beams 32 to 34. In addition, some of the upper end blocks 24 have two positioning surfaces 243, 244 for positioning the front upper end beam 31 described below.

[0049] The support surface 241 faces upward. The female screw hole 245 and the insertion hole 242 open to the support surface 241. The positioning surfaces 243 and 244 extend upward from the edge of the support surface 241 and support the longitudinal ends of the front upper beam 31 from the sides. The two positioning surfaces 243 and 244 face in different directions.

[0050] As shown in FIGS. 2 and 14 , the multiple upper beams 31-34 each extend between the upper ends of two adjacent columns 20 along the edge of the bottom surface portion 10 (bottom plate members 11, 12). The longitudinal end of each upper beam 31-34 is fixed to the upper end of the column 20 by screws. In this embodiment, the upper beams 31-34 are each formed by bending a metal plate. The bending curve of each upper beam 31-34 extends in the longitudinal direction of the upper beam 31-34. As described above, there are four columns 20 in this embodiment, and therefore there are also four upper beams 31-34. The four upper beams 31-34 include a front upper beam 31, a rear upper beam 32, a left upper beam 33, and a right upper beam 34.

[0051] The front upper beam 31 extends in the X direction between the upper ends of two pillars 20 adjacent in the X direction on the front side (-Y side). The rear upper beam 32 extends in the X direction between the upper ends of pillars 20 adjacent in the X direction on the rear side (+Y side). The left upper beam 33 extends in the Y direction between the upper ends of pillars 20 adjacent in the Y direction on the left side (+X side). The right upper beam 34 extends in the Y direction between the upper ends of pillars 20 adjacent in the Y direction on the right side (-X side). These four upper beams 31 to 34 are arranged to form a rectangular shape in plan view corresponding to the bottom surface portion 10 when viewed from the Z direction.

[0052] As shown in Figure 15, the longitudinal end of the front upper beam 31 is positioned on a support surface 241 of the upper end block 24 of the front-located support column 20. The longitudinal end of the front upper beam 31 also contacts two positioning surfaces 243, 244 of the upper end block 24. Figure 15 only shows the state in which one longitudinal end of the front upper beam 31 is positioned on the front-located upper end block 24, but the other longitudinal end of the front upper beam 31 is also positioned on the upper end block 24. This positions the front upper beam 31 with respect to the two adjacent support columns 20. In this state, both longitudinal ends of the front upper beam 31 are fixed to the upper ends of these two support columns 20 by screws.

[0053] As shown in Figures 14 and 16, insertion pieces 35 are provided at both longitudinal ends of the rear upper beam 32, the left upper beam 33, and the right upper beam 34. The insertion pieces 35 are inserted into the insertion holes 242 of the upper block 24 of the corresponding support 20, with both longitudinal ends of the rear upper beam 32, the left upper beam 33, and the right upper beam 34 positioned on the support surface 241 of the upper block 24 of the corresponding support 20. As a result, the rear upper beam 32, the left upper beam 33, and the right upper beam 34 are each positioned relative to the two adjacent support columns 20. In this state, both longitudinal ends of the rear upper beam 32, the left upper beam 33, and the right upper beam 34 are fixed to the upper ends of the two support columns 20 by screws. By positioning the rear upper beam 32, the left upper beam 33 and the right upper beam 34 in this manner, the two pillars 20 located on both sides of the longitudinal direction of each of the rear upper beam 32, the left upper beam 33 and the right upper beam 34 can be positioned relative to each other.

[0054] As shown in FIGS. 1 and 2 , the side panels 40 constitute the sides of the housing 2 that extend upward (in the +Z direction) from the edges of the bottom portion 10 (bottom plate members 11, 12). The side panels 40 cover an area surrounded by the edges of the bottom portion 10, two adjacent support columns 20 along the edges of the bottom portion 10, and the upper beams 31 to 34 that extend between the upper ends of these two support columns 20. The side panels 40 of this embodiment are made of metal plates. The housing 2 of this embodiment has four side panels 40. The four side panels 40 include a front panel 40C, a rear panel 40D, a left panel 40E, and a right panel 40F.

[0055] As shown in FIG. 2 , the front panel 40C constitutes the front surface of the housing 2. The front panel 40C is formed in a rectangular shape in a plan view, with a side extending in the Z direction and a side extending in the X direction. An opening 44C is formed in the front panel 40C for passing the projection lens 3 (see FIG. 1 ). The side extending in the X direction at the lower end of the front panel 40C is fixed to the long side of the bottom surface portion 10 located on the front side. Two sides extending in the Z direction on the left and right sides of the front panel 40C are fixed to two support columns 20 adjacent in the X direction on the front side of the bottom surface portion 10. The side extending in the X direction at the upper end of the front panel 40C is fixed to the front upper beam 31 extending in the X direction.

[0056] The rear panel 40D constitutes the rear surface of the housing 2. The rear panel 40D is formed in a rectangular shape in a plan view, with a side extending in the Z direction and a side extending in the X direction. The side extending in the X direction on the lower side of the rear panel 40D is fixed to the long side of the bottom surface portion 10 located on the rear side. The two sides extending in the Z direction on the left and right sides of the rear panel 40D are fixed to two support columns 20 adjacent in the X direction on the rear side of the bottom surface portion 10. The side extending in the X direction on the upper side of the rear panel 40D is fixed to the rear upper beam 32 extending in the X direction.

[0057] The left panel 40E constitutes the left side of the housing 2. The left panel 40E is formed in a rectangular shape in a plan view, with a side extending in the Z direction and a side extending in the Y direction. The side extending in the Y direction on the lower side of the left panel 40E is fixed to the short side of the bottom surface portion 10 located on the left side. The two sides extending in the Z direction on the front and rear sides of the left panel 40E are fixed to two support columns 20 adjacent in the Y direction on the left side of the bottom surface portion 10. The side extending in the Y direction on the upper side of the left panel 40E is fixed to the left upper beam 33 extending in the Y direction.

[0058] The right side panel 40F constitutes the right side surface of the housing 2. The right side panel 40F is formed in a rectangular shape in a plan view, with a side extending in the Z direction and a side extending in the Y direction. The side extending in the Y direction on the lower side of the right side panel 40F is fixed to the short side of the bottom surface portion 10 located on the right side. The two sides extending in the Z direction on the front and rear sides of the right side panel 40F are fixed to two support columns 20 adjacent in the Y direction on the right side of the bottom surface portion 10. The side extending in the Y direction on the upper side of the right side panel 40F is fixed to the right upper beam 34 extending in the Y direction.

[0059] As shown in Figures 1 and 2, the top panel 50 of the housing 2 constitutes the upper surface of the housing 2. The top panel 50 of this embodiment is made of a metal plate. The thickness direction of the top panel 50 is oriented in the Z direction. The top panel 50 faces the bottom surface portion 10 in the Z direction. The shape of the top panel 50 in a plan view when viewed from the thickness direction corresponds to the shape of the bottom surface portion 10 in a plan view. In other words, the shape of the top panel 50 in a plan view is formed into a rectangular shape with the longer side extending in the X direction.

[0060] The top panel 50 is fixed to the four upper beams 31 to 34 by screws or the like. Specifically, the two long sides of the top panel 50 are fixed to the front upper beam 31 and the rear upper beam 32, and the two short sides of the top panel 50 are fixed to the left upper beam 33 and the right upper beam 34.

[0061] In the housing 2 of this embodiment, the adjacent front panel 40C and the left and right panels 40E and 40F are spaced apart, and the adjacent rear panel 40D and the left and right panels 40E and 40F are spaced apart. Therefore, the housing 2 of this embodiment further includes four support column cover members 60. The four support column cover members 60 are disposed in the gaps between the adjacent front panel 40C and the left and right panels 40E and 40F, and in the gaps between the adjacent rear panel 40D and the left and right panels 40E and 40F, respectively, to cover the support columns 20 from the outside. The support column cover members 60 in this embodiment are made of resin, but may also be made of metal, for example.

[0062] Next, an example of an assembly method for assembling the above-described housing 2 will be described. When assembling the housing 2, a block positioning process is first carried out to position two of the four connection blocks 13 relative to one another, as shown in FIGS. 7 to 9 . In the block positioning process, a positioning jig 100 is used. The positioning jig 100 has a flat placement surface 100a on which the connection blocks 13 are placed. The positioning jig 100 also has a first positioning wall 101 and a second positioning wall 102 provided on the placement surface 100a. The first positioning wall 101 and the second positioning wall 102 are positioned at an interval in the X direction.

[0063] The first positioning wall portion 101 has a first abutting surface 101a and a second abutting surface 101b that abut and bring into surface contact with the two contacted surfaces 131c, 131d of the first connecting block 13C arranged on the arrangement surface 100a. The first abutting surface 101a faces the rear (+Y side) and extends in the X direction in a plan view seen from the Z direction. The second abutting surface 101b faces the left (+X side) and extends in the Y direction in a plan view seen from the Z direction. Therefore, the first abutting surface 101a and the second abutting surface 101b are perpendicular to each other.

[0064] The second positioning wall portion 102 has a third abutment surface 102a and a fourth abutment surface 102b that abut and bring into surface contact with the two contacted surfaces 131c, 131d of the second connection block 13D arranged on the placement surface 100a. The third abutment surface 102a faces the rear (+Y side) and extends in the X direction in a plan view seen from the Z direction. The third abutment surface 102a is located on the same line as the first abutment surface 101a when viewed from the Z direction. The fourth abutment surface 102b faces the left (+X side) and extends in the Y direction in a plan view seen from the Z direction. Therefore, the third abutment surface 102a and the fourth abutment surface 102b are perpendicular to each other. The fourth abutment surface 102b faces the second abutment surface 101b of the first positioning wall portion 101 in the X direction.

[0065] In the block positioning process, four connection blocks 13 are placed on the placement surface 100a of the positioning jig 100. The two contact surfaces 131c, 131d of the first connection block 13C are brought into surface contact with the first abutment surface 101a and the second abutment surface 101b of the first positioning wall 101. The two contact surfaces 131c, 131d of the second connection block 13D are brought into surface contact with the third abutment surface 102a and the fourth abutment surface 102b of the second positioning wall 102. This determines the positions and orientations of the first and second connection blocks 13C, 13D. Furthermore, the first and second connection blocks 13C, 13D are positioned relative to each other.

[0066] After the block positioning step, a block mounting step is performed. As shown in Figures 8 and 9, in the block mounting step, the four connection blocks 13 arranged on the placement surface 100a are attached to the second bottom plate member 12 with screws (not shown). Furthermore, the first and second connection blocks 13C and 13D, which have been positioned relative to each other, are fixed to the second bottom plate member 12 with screws. The second fixing insertion holes 141D of the second bottom plate member 12, through which the screws for fixing the second connection block 13D pass, are formed as elongated holes extending in the arrangement direction of the first and second connection blocks 13C and 13D. Therefore, even if there is an error in the relative positions of the first and second fixing insertion holes 141C and 141D formed in the second bottom plate member 12, the first and second connection blocks 13C and 13D can be fixed to the second bottom plate member 12 with screws.

[0067] On the other hand, the third connection block 13E and the fourth connection block 13F are simply attached to the second bottom plate member 12 by screws, and can each move parallel to the plate member main body 14 in directions along its main surface (X direction, Y direction) within a predetermined range.

[0068] After the block attaching step, the positioning jig 100 is separated from the four connection blocks 13. Then, the four connection blocks 13 attached to the second bottom plate member 12 are also attached to the first bottom plate member 11. The first and second bottom plate members 11, 12 are fixed to each other. Note that, for example, in the block attaching step, the four connection blocks 13 may be attached to the first bottom plate member 11, and after the block attaching step, the four connection blocks 13 attached to the first bottom plate member 11 may also be attached to the second bottom plate member 12.

[0069] As shown in FIG. 12 , after the block mounting process, a support fixing process is performed in which the four support columns 20 are individually fixed to the four connection blocks 13 attached to the bottom plate members 11 and 12. As shown in FIG. 13 , in the support fixing process, the protrusions 132 of each connection block 13 are inserted into the insertion holes 21 of each support column 20. With the protrusions 132 inserted into the insertion holes 21, the upper ends of the insertion holes 21 are brought into contact with the upper flat surfaces 132 a of the protrusions 132. Furthermore, the two contact surfaces 22 of each support column 20 are brought into surface contact with the two contacted surfaces 131 c, 131 d of the connection block 13, respectively. This positions each support column 20 relative to each connection block 13. Specifically, the support columns 20 are positioned relative to the connection blocks 13 in the Z direction when the upper ends of the insertion holes 21 come into contact with the upper flat surfaces 132 a of the protrusions 132. In addition, the two contact surfaces 22 of the support 20 come into surface contact with the two contacted surfaces 131c, 131d of the connection block 13, respectively, thereby positioning the support 20 relative to the connection block 13 in directions perpendicular to the Z direction (X direction and Y direction).

[0070] In this state, the screw 91 is passed through the support 20 (second strip portion 232) and then screwed into the third female threaded hole 135 of the connection block 13. This fixes the support 20 to the connection block 13. This keeps the protrusion 132 of the connection block 13 inserted into the insertion hole 21 of the support 20. In addition, the two contact surfaces 22 of the support 20 are kept in surface contact with the two contacted surfaces 131c, 131d of the connection block 13, respectively.

[0071] 14, after the support fixing step, a beam attaching step is carried out in which the four upper beams 31 to 34 are attached by bridging them between the upper ends of two adjacent support columns 20 along the edges of the bottom surface portion 10 (bottom plate members 11, 12). In the beam attaching step, both longitudinal ends of each of the upper beams 31 to 34 are fixed to the upper ends of the two adjacent support columns 20 with screws 92.

[0072] 14 and 15, in the beam attachment process, both longitudinal ends of the front upper beam 31 are placed on the support surfaces 241 located at the upper ends of the two front support columns 20, and are also brought into contact with the two positioning surfaces 243, 244 located at the upper ends of the two support columns 20. In this way, the front upper beam 31 is positioned relative to the two front support columns 20.

[0073] 14 and 16 , in the beam attachment process, both longitudinal ends of the rear upper beam 32, left upper beam 33, and right upper beam 34 are placed on support surfaces 241 located at the upper ends of two adjacent columns 20. Furthermore, the insertion pieces 35 provided on both longitudinal ends of the rear upper beam 32, left upper beam 33, and right upper beam 34 are inserted into insertion holes 242 formed at the upper ends of the two adjacent columns 20. As a result, the rear upper beam 32, left upper beam 33, and right upper beam 34 are positioned relative to the two adjacent columns 20.

[0074] By positioning the rear upper beam 32, the left upper beam 33, and the right upper beam 34 in this manner, the two support columns 20 located on both sides of the rear upper beam 32, the left upper beam 33, and the right upper beam 34 in the longitudinal direction can be relatively positioned. Specifically, the left upper beam 33 and the right upper beam 34 can position the rear support column 20 and the third and fourth connection blocks 13E and 13F using the front support column 20 and the first and second connection blocks 13C and 13D as references. Furthermore, the rear upper beam 32 can relatively position the two rear support columns 20 and the third and fourth connection blocks 13E and 13F.

[0075] After the beam attachment step, a block fixing step is carried out in which all of the connection blocks 13 are fixed to the bottom plate members 11 and 12. Specifically, in the block fixing step, the third and fourth connection blocks 13E and 13F positioned in the beam attachment step are fixed to the bottom plate members 11 and 12 by screws.

[0076] 2, after the block fixing process, a panel mounting process is carried out in which four side panels 40 and one top panel 50 are mounted. In the panel mounting process, the four side panels 40 are fixed by screws or the like to the edges of the bottom portion 10 (bottom plate members 11, 12), two adjacent columns 20 along the edge of the bottom portion 10, and upper beams 31 to 34 extending between the upper ends of these two columns 20. As a result, each side panel 40 covers the area surrounded by the edges of the bottom portion 10, the two adjacent columns 20 along the edge of the bottom portion 10, and the upper beams 31 to 34 extending between the upper ends of these two columns 20.

[0077] Furthermore, in the panel mounting process, the top panel 50 is fixed to the four upper beams 31 to 34 by screws or the like, thereby covering the area surrounded by these four upper beams 31 to 34. Also, in the panel mounting process, the support column cover members 60 are placed in the gaps between the adjacent front panel 40C and the left panel 40E and the right panel 40F, and in the gaps between the adjacent rear panel 40D and the left panel 40E and the right panel 40F. This causes the support columns 20 to be covered by the support column cover members 60. This completes the method for assembling the housing 2.

[0078] As described above, in the projection display device 1 of this embodiment, the multiple support columns 20 are fixed to the bottom plate members 11, 12 via the connection blocks 13. Therefore, by fixing at least two of the multiple connection blocks 13 to the bottom plate members 11, 12 while they are positioned relative to one another, all of the components of the housing 2 (the bottom plate members 11, 12, the multiple connection blocks 13, the multiple support columns 20, the multiple upper beams 31-34, the multiple side panels, and the top panel 50) can be fixed to one another using the positions of these two connection blocks 13 as a reference. This allows the housing 2 to be assembled with small assembly tolerances.

[0079] Furthermore, in the projection display device 1 of this embodiment, a plurality of fixing through-holes 141 through which screws (not shown) for fixing the plurality of connection blocks 13 to the bottom plate members 11, 12 are inserted are formed through the bottom plate members 11, 12. Of the plurality of fixing through-holes 141, the first fixing through-hole 141C corresponding to the first connection block 13C is formed in a circular shape of the same size as the first female threaded hole 133 of the first connection block 13C. Of the plurality of fixing through-holes 141, the second fixing through-hole 141D corresponding to the second connection block 13D is formed as an elongated hole extending in the arrangement direction of the first and second fixing through-holes 141C, 141D. This allows the first connection block 13C and the second connection block 13D to be fixed to the bottom plate members 11, 12 by screwing, even if there is an error or variation in the relative positions of the first and second fixing through-holes 141C, 141D formed in the bottom plate members 11, 12.

[0080] Furthermore, in the projection display device 1 of this embodiment, the fixing through-holes 141 (third and fourth fixing through-holes 141E, 141F) excluding the first fixing through-hole 141C and second fixing through-hole 141D are formed in a circular shape that is larger than the corresponding first female screw holes 133 of the connection blocks 13 (third and fourth connection blocks 13E, 13F). Therefore, even if there is an error or variation in the relative positions of the multiple fixing through-holes 141 formed in the bottom plate members 11, 12, the connection blocks 13 (third and fourth connection blocks 13E, 13F) can be fixed to the bottom plate members 11, 12 by screwing.

[0081] Furthermore, in the projection display device 1 of this embodiment, each connection block 13 has a protrusion 132 that protrudes in a direction along the main surface of the bottom plate members 11, 12, and two contact surfaces 131c, 131d that extend in the thickness direction of the bottom plate members 11, 12 and face in different directions. Furthermore, the support 20 has an insertion hole 21 into which the protrusion 132 is inserted, and two contact surfaces 22 that come into surface contact with the two contact surfaces 131c, 131d, respectively, when the protrusion 132 is inserted into the insertion hole 21. This allows the support 20 to be positioned with respect to the connection block 13.

[0082] Furthermore, in the projection display device 1 of this embodiment, the housing 2 includes multiple upper beams 31-34 extending between the upper ends of two adjacent support columns 20 along the edges of the bottom plate members 11 and 12. Therefore, the multiple upper beams 31-34 can be used to position the other connection blocks 13 (third and fourth connection blocks 13E and 13F) other than the two reference connection blocks 13 (first and second connection blocks 13C and 13D). In this regard, the two support columns 20 fixed to the two reference connection blocks 13 also serve as references for assembling the housing 2. The other connection blocks 13 can be positioned via the two reference support columns 20, the upper beams 31-34 connected thereto, and the other support columns 20 fixed to the other connection blocks 13, and can be fixed to the bottom plate members 11 and 12 in this state. This allows the housing 2 to be assembled with small assembly tolerances.

[0083] Furthermore, in the method for assembling the housing 2 of this embodiment, in a block positioning step, at least two of the multiple connection blocks 13 (first and second connection blocks 13C and 13D) are relatively positioned by a positioning jig 100. Then, in a block attachment step, the two positioned connection blocks 13 are fixed to the bottom plate members 11 and 12. Therefore, all of the components of the housing 2 (the bottom plate members 11 and 12, the multiple connection blocks 13, the multiple support columns 20, the multiple upper beams 31 to 34, the multiple side panels, and the top panel 50) can be fixed to one another using the positions of these two connection blocks 13 as a reference. This allows the housing 2 to be assembled with small assembly tolerances.

[0084] Furthermore, in the method for assembling the housing 2 of this embodiment, the two support columns 20 fixed to the two connection blocks 13 (first and second connection blocks 13C and 13D) that serve as references in the support column fixing process also serve as references for assembling the housing. Then, by performing the beam attachment process after the support column fixing process, the other connection blocks 13 (third and fourth connection blocks 13E and 13F) can be positioned via the two reference support columns 20, the upper beams 31 to 34 connected thereto, and the other support columns 20. This makes it possible to assemble a housing 2 with small assembly tolerances.

[0085] 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.

[0086] In the present invention, the bottom surface portion 10 may be configured, for example, by one bottom plate member and a plurality of connection blocks 13. In this case, the bottom plate member may be configured, for example, by only the flat plate member main body 14.

[0087] In the present invention, the side panel 40 of the housing 2 may be, for example, a cylindrical peripheral wall panel extending upward from the bottom surface portion 10 .

[0088] In the housing assembly method of the present invention, the block positioning step may involve relatively positioning three or more connection blocks 13 using, for example, a positioning jig 100. In this case, the positioning jig 100 only needs to have positioning walls the number of which corresponds to the number of connection blocks 13 for which relative positioning is to be performed.

[0089] 1 Projection display device 2 Housing 11 First bottom plate member (bottom plate member) 11a, 11b Main surface 12 Second bottom plate member (bottom plate member) 12a, 12b Main surface 13 Connection block 13C First connection block 13D Second connection block 13E Third connection block 13F Fourth connection block 20 Support 21 Insertion hole 22 Contact surface 31 Front upper beam (upper beam) 32 Rear upper beam (upper beam) 33 Left upper beam (upper beam) 34 Right upper beam (upper beam) 40 Side panel 40C Front panel 40D Rear panel 40E Left panel 40F Right panel 100 Positioning jig 100a Placement surface 131 Block body 131c, 131d Contact surface 132 Protrusion 133 First female screw hole (female screw hole) 141 Fixing insertion hole 141C First fixing insertion hole 141D Second fixing insertion hole 141E Third fixing insertion hole 141F Fourth fixing insertion hole

Claims

1. A projection display device whose housing comprises a bottom plate member, a plurality of connection blocks each fixed to a main surface of the bottom plate member and spaced apart along the edge of the bottom plate member, and a plurality of support posts each fixed to the connection blocks and extending upward from the edge of the bottom plate member.

2. The projection display device according to claim 1, wherein the connection blocks are fixed to the bottom plate member with screws, the bottom plate member has a plurality of fixing through-holes through which the screws are inserted, the plurality of connection blocks have female threaded holes through which the screws are threaded, a first fixing through-hole of the plurality of fixing through-holes is formed in a circular shape corresponding to the female threaded hole of the connection block, and a second fixing through-hole of the plurality of fixing through-holes adjacent to the first fixing through-hole is formed as an elongated hole extending in the arrangement direction of the first fixing through-hole and the second fixing through-hole.

3. The projection display device according to claim 2, wherein the fixing insertion holes excluding the first fixing insertion hole and the second fixing insertion hole are formed larger than the first fixing insertion hole.

4. A projection display device as claimed in any one of claims 1 to 3, wherein the connection block has a block body that is overlaid on and fixed to the main surface of the bottom plate member, and a protrusion that protrudes from the block body in a direction along the main surface, the block body extending in the thickness direction of the bottom plate member and having two contact surfaces that face in different directions, and the support has an insertion hole for inserting the protrusion and two contact surfaces that respectively make surface contact with the two contact surfaces when the protrusion is inserted into the insertion hole.

5. A projection display device according to any one of claims 1 to 3, wherein the housing comprises a plurality of upper beams each extending between the upper ends of two adjacent support columns along the edge of the bottom plate member.

6. A projection display device according to claim 5, wherein the housing has side panels that cover the area surrounded by the edge of the bottom plate member, the two adjacent support columns along the edge of the bottom plate member, and the upper beam extending between the upper ends of these two support columns.

7. A method for assembling a housing for use in a projection display device, comprising: arranging a plurality of connection blocks on the arrangement surface of a positioning jig; positioning at least two of the plurality of connection blocks relative to one another; attaching the plurality of connection blocks arranged on the arrangement surface to a bottom plate member; and fixing the two relatively positioned connection blocks to the bottom plate member; and then fixing a plurality of supports individually to the plurality of connection blocks.

8. The method for assembling a housing according to claim 7, further comprising attaching a plurality of upper beams so as to span between the upper ends of two adjacent support columns along the edge of the bottom plate member, and then fixing all of the connection blocks to the bottom plate member.

Images