Indirect lighting structure

Abstract

To provide an indirect lighting structure which hides a light source and which is high in designability.SOLUTION: An indirect lighting structure 1 comprises: a holding tool 6 including first tops 3a, 3b, rear ends 5a, 5b formed below the first tops 3a, 3b, a fitting part 60 fixed above the first tops 3a, 3b and extending downward in a support member fixed to a structural skeleton, and an arm 61 protruding from the fitting part 60 down with a distance from the first tops 3a, 3b; a backing board 7 including a base end fixing part 70 fixed along the arm 61, a groove forming part 71 further extending from the base end fixing part 70 to have a groove 77 formed at the rear ends 5a, 5b on the upper surface, and a tip inclined part 72 having a rising surface 75 rising from a bottom surface 78 of the groove 77 and an inclined surface 76 of a down-grade toward the tip, and serving as a base for a second top 10 lower than the first tops; and a light source 8 disposed in the groove 77.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an indirect lighting structure. [Background technology]

[0002] Conventionally, indirect lighting has been used, which reflects light off the ceiling and uses that reflected light to illuminate the surrounding area. For example, the indirect lighting disclosed in Patent Document 1 has a support base fixed to the side of a beam protruding below the ceiling, and a light source placed on the support base illuminates the ceiling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-63885 Summary of the Invention [Problem to be solved by the invention]

[0004] Indirect lighting creates a sense of depth and spaciousness in a space with soft light, but if the light source is directly visible to the users of the space where the indirect lighting is installed, these advantages cannot be realized.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an indirect lighting structure that conceals the light source and has a high design quality. [Means for solving the problem]

[0006] A first indirect lighting structure that solves the above problem comprises: a holder having a first ceiling; a rear end portion formed downward from the first ceiling; an attachment portion fixed to a support member fixed to a structural body and extending downward from the first ceiling along the rear end portion; and an arm portion protruding from the attachment portion in a direction intersecting the rear end portion below and spaced apart from the first ceiling; a base end fixing portion fixed along the arm portion; a groove forming portion extending further from the base end fixing portion and having a groove portion formed on its upper surface at the rear end portion; a tip inclined portion having a rising surface rising from the bottom surface of the groove portion and a sloping surface sloping downward from the upper end of the rising surface to the tip, the lighting base plate serving as a base for a second ceiling whose underside is lower than the first ceiling; and a light source arranged in the groove portion.

[0007] The second indirect lighting structure is the first indirect lighting structure, except that multiple lighting base plates are provided and the lighting base plates are arranged in a direction parallel to the rear end, and the second ceiling is formed by attaching multiple ceiling plates to the underside of the lighting base plate in a direction parallel to the rear end, and the joints between the lighting base plates and the joints between the ceiling plates are arranged so as to be offset from each other in a direction parallel to the rear end.

[0008] The third indirect lighting structure is the second indirect lighting structure, wherein the lighting base plate has a vertical through hole and is fixed to the arm portion by a base fixing bolt inserted into the through hole from below, and the lower end of the through hole is enlarged to form a deep countersunk hole into which the head of the base fixing bolt can fit.

[0009] The fourth indirect lighting structure is the second indirect lighting structure, further comprising a third ceiling extending from a lower end of the rear end portion in a direction opposite to the protruding direction of the arm portion and flush with the second ceiling.

[0010] A fifth indirect lighting structure is any one of the first to fourth indirect lighting structures, in which the light source is placed on the bottom surface of the groove so as to be movable in the width direction of the groove.

[0011] A sixth indirect lighting structure is any one of the first to fifth indirect lighting structures, wherein the height of the light source is equal to the height of the rising surface of the tip inclined portion.

[0012] The seventh indirect lighting structure is any one of the first to sixth indirect lighting structures, wherein the light source has a first surface facing the tip inclined portion and a second surface facing the rear end portion, and the second surface emits light with a higher luminous intensity than the first surface.

[0013] The eighth indirect lighting structure is a structure in which the first ceiling in the first to seventh indirect lighting structures has a first inclined surface that rises away from the rear end, a second inclined surface that descends away from the first inclined surface, and a connecting surface that connects the first inclined surface and the second inclined surface, and the connecting surface is a curved surface that smoothly connects to the upper ends of the first inclined surface and the second inclined surface and bulges upward, and the curved surface is formed below the ridge beam.

[0014] A ninth indirect lighting structure is the eighth indirect lighting structure, wherein the second inclined surface is formed so that an end portion thereof away from the connecting surface extends to a position lower than the lighting base plate. [Effects of the Invention]

[0015] According to the first indirect lighting structure, the mounting portion of the holder is fixed to a support member fixed to the structural frame above the first ceiling, and the arm of the holder secures the base end fixing portion of the lighting base plate. Therefore, the lighting base plate is firmly fixed to the structural frame via the holder and the support member. The groove-forming portion and the inclined tip portion can be further extended from the base end fixing portion, allowing the lighting base plate to be extended in a direction intersecting the rear end. Therefore, the rear end is positioned deep within the space formed between the first ceiling and the lighting base plate, making the rear end and the light source less visible from the indoor space below the second ceiling, improving the design. Furthermore, the inclined tip portion of the lighting base plate conceals the light source with its raised surface, and the inclined surface is formed downwardly toward the tip, allowing the tip to be thinner than the overall thickness of the lighting base plate, creating a sharp impression. Furthermore, by providing the tip inclined portion, the tip inclined portion side can be made lighter than the base end fixing portion side, and the lighting base plate can be extended longer in the direction intersecting with the rear end portion.

[0016] According to the second indirect lighting structure, the lighting base plates are arranged in a direction parallel to the rear end, and the ceiling panels are attached to the underside of the lighting base plates in a direction parallel to the rear end, and the joints between the lighting base plates and the joints between the ceiling panels are offset from each other in a direction parallel to the rear end, so the ceiling panels can prevent the lighting base plates from being offset in the vertical direction, preventing a decrease in the design of the second ceiling.

[0017] According to the third indirect lighting structure, a deep countersunk hole is formed at the lower end of the through hole that passes vertically through the lighting base plate, so that the head of the base fixing bolt for fixing the lighting base plate to the arm portion does not protrude from the underside of the lighting base plate, and the ceiling plate can be attached to the underside of the lighting base plate with precision, resulting in a smooth finish to the second ceiling.

[0018] According to the fourth indirect lighting structure, the third ceiling further extends from the lower end of the rear end, flush with the second ceiling, in the opposite direction to the protruding direction of the arm, and since there is no need to match the position of the rear end with the exterior wall or partition wall, the freedom of the position at which the rear end and lighting base plate are installed is increased, and the design freedom of the position at which indirect lighting is formed can be improved.

[0019] According to the fifth indirect lighting structure, the light source is placed on the bottom surface of the groove and is movable in the width direction of the groove, so that by adjusting the position of the light source, the direction and illuminance of the light irradiated onto the first ceiling can be adjusted, and therefore, it can be easily adjusted according to various factors such as the shape of the first ceiling and the user's preferences.

[0020] According to the sixth indirect lighting structure, the height of the light source is equal to the height of the rising surface of the tip inclined portion, so the light source can be reliably hidden from heights lower than the lighting base plate, resulting in lighting with a soft atmosphere.

[0021] According to the seventh indirect lighting structure, the second surface facing the rear end of the light source emits light with a higher luminous intensity than the first surface facing the tip inclined portion, thereby preventing strong light from being directly irradiated onto the first ceiling and providing softer indirect lighting.

[0022] According to the eighth indirect lighting structure, the first ceiling is a gable-shaped sloped ceiling, but the connecting surface connecting the first inclined surface and the second inclined surface is a smoothly connected curved surface, and since the curved surface is formed below the ridge beam, there is nothing on the first ceiling that blocks the light, and no bends are formed on the first ceiling, so the illuminance of the light irradiated onto the first ceiling is smoothly continuous, allowing the light from the light source to reach farther and the entire indoor space below the first ceiling to be enveloped in soft light with minimal lighting.

[0023] According to the ninth indirect lighting structure, the end of the second inclined surface away from the connecting surface extends to a position lower than the lighting base plate, so the first ceiling can be extended longer and the light from the light source can reach a longer distance smoothly. Also, because the position of the second inclined surface farthest from the light source is formed lower than the lighting base plate, it is possible to more effectively prevent the light source from being directly visible. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a cross-sectional view illustrating the overall configuration of an indirect lighting structure according to a first embodiment. [Figure 2] FIG. 3 is an enlarged cross-sectional view of a portion where an illumination base plate is provided in the indirect lighting structure of the first embodiment. [Figure 3] 1 is a perspective view illustrating the external configuration of a holder of an indirect lighting structure according to a first embodiment. [Figure 4] FIG. 2 is a perspective view illustrating the external configuration of the lighting base plate of the indirect lighting structure of the first embodiment. [Figure 5] 1 is a cross-sectional view illustrating the configuration of an illumination base plate and a light source of the indirect lighting structure of the first embodiment. [Figure 6] 1 is an exploded perspective view illustrating a joining structure of a holder, a lighting base plate, and a ceiling plate of the indirect lighting structure of the first embodiment. FIG. [Figure 7] FIG. 10 is a cross-sectional view illustrating the overall configuration of the indirect lighting structure according to the second embodiment. [Figure 8] FIG. 10 is an enlarged cross-sectional view of a portion where an illumination base plate is provided in the indirect lighting structure of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] [First embodiment] A first embodiment of the indirect lighting structure of the present invention will be described below with reference to FIGS. 1 to 6. The indirect lighting structure 1a is a structure installed in an indoor space 2 of a building, such as a house, and illuminates the indoor space 2 by irradiating light onto a first ceiling 3a covering the indoor space 2. The indoor space 2 is assumed to be, for example, a living room, dining room, kitchen, or other living room, but is not limited thereto. The indirect lighting structure 1a can be applied to various indoor spaces. The building in which the indirect lighting structure 1a is installed has slope beams 41 that slope downward on both sides of a ridge beam 40. Rafters 42, sheathing boards 43, roofing materials 44, and roofing materials 45 are arranged on top of the slope beams 41 to form a gable roof 4. The roof shape of the building in which the indirect lighting structure 1a of the present invention is installed is not limited to the gable roof 4. Furthermore, the building in which the indirect lighting structure 1a is installed is not limited to a house.

[0026] As shown in Figures 1 and 2, the indirect lighting structure 1a comprises a first ceiling 3a, a rear end portion 5a extending downward from the first ceiling 3a, an angled holder 6 extending downward along the rear end portion 5a and protruding in a direction intersecting the rear end portion 5a, a lighting base plate 7 fixed to the holder 6, and a light source 8 arranged in a groove portion 77 formed in the lighting base plate 7.

[0027] In this embodiment, the first ceiling 3a has a slope that follows the roof shape. The first ceiling 3a has a first inclined surface 30 that rises away from the rear end 5a, a second inclined surface 31 that falls away from the first inclined surface 30, and a connecting surface 32 that connects the first inclined surface 30 and the second inclined surface 31. The upper end of the first inclined surface 30 connects to the connecting surface 32, and the lower end connects to the rear end 5a. The upper end of the second inclined surface 31 connects to the connecting surface 32 on the opposite side of the first inclined surface 30, and the lower end connects to a wall surface 46 that is formed parallel to the rear end 5a on the opposite side across the indoor space 2.

[0028] The first inclined surface 30 and the second inclined surface 31 are each formed by attaching a panel material such as gypsum board to a joist 33 suspended below a downward-sloping gradient beam 41 from the ridge beam 40. The connecting surface 32 is formed by attaching a panel material to a base material 34 fixed below the ridge beam 40. The panel material of the connecting surface 32 smoothly connects the upper ends of the first inclined surface 30 and the second inclined surface 31, and is formed by a curved shape that bulges upward. The connecting surface 32 is formed in an arc shape with a radius of 2000 mm, and the first inclined surface 30 and the second inclined surface 31 are flat surfaces with a 4 / 10 slope that slope in opposite directions away from the connecting surface 32.

[0029] The undersides of the panels forming the first inclined surface 30, the second inclined surface 31, and the connecting surface 32 are coated with a decorative plastering material 35, forming a smooth, integrated surface. The panel forming the connecting surface 32 is curved to be lower than the ridge beam 40, preventing the ridge beam 40 from protruding from the first ceiling 3a. The roof is supported by slope beams 41 formed above the first and second inclined surfaces 30 and 31, preventing structural members such as the purlins 36 and rafters 37 from protruding from the first and second inclined surfaces 30 and 31. The first ceiling 3a is completely free of any fixtures that would create uneven surfaces, such as lighting fixtures, fire alarms, and air conditioning equipment. This creates a completely smooth surface, allowing light irradiated onto the first ceiling 3a to extend far from the light source 8 without being blocked. Furthermore, because of the presence of the first inclined surface 30 and the second inclined surface 31, light reflected by the first inclined surface 30 is further reflected by the second inclined surface 31, allowing the indoor space 2 formed below to be illuminated further, and the entire indoor space 2 below the first ceiling 3a can be enveloped in soft light with minimal lighting. Note that the description that the first ceiling 3a is a completely smooth surface does not exclude a configuration in which the first ceiling 3a has slight depressions at the joints between the panel materials that form the first inclined surface 30, the second inclined surface 31, and the connecting surface 32, or slight unevenness due to the nature of the finishing decorative material 35.

[0030] The first ceiling 3a is formed so that the end of the second inclined surface 31 away from the connecting surface 32 extends to a position lower than the lighting base plate 7. Specifically, the length of the second inclined surface 31 from the connecting surface 32 to the wall surface 46 is longer than the length of the first inclined surface 30 from the rear end 5a to the connecting surface 32, and the second inclined surface 31 is positioned 1 m longer horizontally than the first inclined surface 30. As a result, the height of the bottom end of the second inclined surface 31 is lower than the height of the bottom end of the first inclined surface 30. The height β of the position where the bottom end of the second inclined surface 31 connects to the wall surface 46 is 2025 mm from the floor of the indoor space 2, and the height α of the bottom surface of the lighting base plate 7 is 2358 mm from the floor of the indoor space 2.

[0031] In this way, by extending the lower end of the second inclined surface 31 to a position lower than the lighting base plate 7, the first ceiling 3a can be extended longer, and the light from the light source 8 can reach a longer distance smoothly. Also, by forming the position of the second inclined surface 31 farthest from the light source 8 lower than the lighting base plate 7, it is possible to more effectively prevent the light source 8 from being visible.

[0032] The rear end 5a is supported by columns 47 extending from below and is formed by the indoor side of the girder beam 48 to which the lower ends of the gradient beams 41 are joined. Note that the "structural body" in this embodiment corresponds to the columns 47 that support the girder beam 48, and the "support member" in this embodiment corresponds to the girder beam 48. The rear end 5a is planar and extends downward from the lower end of the first ceiling 3a. In this embodiment, the rear end 5a is formed by the side of the girder beam 48, but a decorative material (not shown) may be attached to it to make it easier to reflect light from the light source 8.

[0033] As shown in FIG. 3 , the holder 6 has a mounting portion 60 and an arm portion 61 formed from steel angle bar, and a reinforcing plate 62 that reinforces the mounting portion 60 and the arm portion 61. The mounting portion 60 is, for example, a flat plate that is long in the vertical direction, and is provided with screw insertion holes 63 at three locations on the top and bottom. The arm portion 61 is also a flat plate that bends from the bottom end of the mounting portion 60 and is formed to extend, for example, horizontally. The arm portion 61 has bolt insertion holes 65 that are aligned in the protruding direction B of the arm portion 61, into which three base fixing bolts 64 can be inserted. The reinforcing plate 62 is a steel plate in the shape of a right triangle, and one side that forms a right angle is welded to the mounting portion 60, and the other side is welded to the arm portion 61, thereby reinforcing the mounting portion 60 and the arm portion 61.

[0034] The retainer 6 is fixed to a girder beam 48, which serves as a support member fixed to a column 47 constituting the structural frame, at a position above the panel material forming the first inclined surface 30 of the first ceiling 3a. Specifically, with the mounting portion 60 of the retainer 6 abutting against the indoor-facing side of the girder beam 48, screws 66 are driven into the girder beam 48 through each of the three screw insertion holes 63 to secure the retainer 6 to the girder beam 48. The positions at which the screws 66 are driven into the girder beam 48 are above the first inclined surface 30, and each screw 66 is hidden by the panel material forming the first inclined surface 30. The mounting portion 60 of the retainer 6 extends below the first ceiling 3a along the rear end portion 5a formed on the indoor-facing side of the girder beam 48, and the arm portion 61 protrudes downward, at a distance from the first ceiling 3a, in a direction B intersecting the rear end portion 5a. In this embodiment, the arm portion 61 protrudes in a horizontal direction perpendicular to the rear end portion 5a. A plurality of holders 6 are fixed in a line along the girder 48 .

[0035] As shown in Figures 4 and 5, the lighting base plate 7 has a plate-shaped base end fixing portion 70 fixed to the arm portion 61, a groove forming portion 71 extending further from the base end fixing portion 70, and a tip inclined portion 72 formed on the opposite side of the groove forming portion 71 from the base end fixing portion 70.

[0036] The base end fixing portion 70 has three vertical through holes 73 aligned in the protruding direction B of the arm portion 61. These through holes 73 are sized to allow the insertion of the base fixing bolts 64 and are formed at positions that overlap the bolt insertion holes 65 of the arm portion 61 in a plan view when the base end fixing portion 70 is abutted against the underside of the arm portion 61. The base fixing bolts 64 are inserted from below the through holes 73 of the base end fixing portion 70 into the through holes 73 and the bolt insertion holes 65 of the arm portion 61, and the nuts 67 are fastened to secure the base end fixing portion 70 to the arm portion 61. The three through holes 73 are also aligned in a direction A parallel to the rear end portion 5a, and each through hole 73 overlaps the bolt insertion holes 65 of the multiple arms 61 protruding from the rear end portion 5a in a plan view. This secures the lighting base plate 7 to the holder 6 fixed to the rear end portion 5a, and the lighting base plate 7 is supported in a cantilevered manner. Because the holder 6 is reinforced by the reinforcing plate 62 so that the arm 61 is kept approximately horizontal, the lighting base plate 7, which is cantilevered by the holder 6, can be made to protrude a long way in the protruding direction B of the arm 61, and the rear end 5a is positioned deep within the space formed between the first ceiling 3a and the lighting base plate 7, making it difficult for the rear end 5a and light source 8 to be seen from the indoor space 2 below, improving the design. The lower end of the through hole 73 of the base end fixing part 70 has an expanded diameter, forming a deep countersunk hole 74 into which the head 68 of the base fixing bolt 64 fits.

[0037] The groove forming portion 71 extends further from the base end fixing portion 70, and a groove portion 77 is formed on the upper surface of the groove forming portion 71 in a direction A parallel to the rear end portion 5a. The groove portion 77 is dug deeper than the upper surface of the base end fixing portion 70 and is formed over the entire length of the lighting base plate 7 in the direction A parallel to the rear end portion 5a, allowing the light source 8 to be installed. The groove portion 77 has, for example, a horizontal bottom surface 78 and vertical side surfaces.

[0038] The tip inclined portion 72 is formed adjacent to the groove portion 77. The tip inclined portion 72 has a rising surface 75 that rises from the bottom surface 78 of the groove portion 77 and a sloping surface 76 that slopes downward from the upper end of the rising surface 75 toward the tip. Since the sloping surface 76 of the tip inclined portion 72 slopes downward toward the tip, the tip can be made thinner than the overall thickness of the lighting base, giving it a sharp impression. Furthermore, the provision of the tip inclined portion 72 makes the tip inclined portion 72 side lighter than the base end fixing portion 70 side, allowing the lighting base board 7 to protrude further in the protrusion direction B of the arm portion 61.

[0039] The underside of the lighting base plate 7 has a base end fixing portion 70, a groove forming portion 71, and front surfaces of the tip inclined portion 72 formed in a substantially horizontal plane. A ceiling plate 9 is attached to the underside of the lighting base plate 7 to form a second ceiling 10. The ceiling plate 9 is a flat gypsum board and is fixed to the lighting base plate 7 by hammering in screws (not shown). At this time, a deep countersunk hole 74 is formed at the bottom end of the through hole 73 in the lighting base plate 7, so the ceiling plate 9 can be tightly attached to the underside of the lighting base plate 7 and fixed with screws.

[0040] As shown in FIG. 6 , multiple lighting base boards 7 are arranged in a direction A parallel to the rear end 5a and secured to their respective holders 6. Multiple ceiling panels 9 are attached to the underside of the lighting base board 7 in a line parallel to the direction A parallel to the rear end 5a to form a second ceiling 10. The joints γ between the lighting base boards 7 and the joints ε between the ceiling panels 9 are offset from each other in the direction A parallel to the rear end 5a. Because the lighting base boards 7 are cantilevered, there is a possibility that a portion of the aligned lighting base boards 7 may bend, causing vertical misalignment between adjacent lighting base boards 7. However, by offsetting the ceiling panels 9, this prevents misalignment at the joints γ between the lighting base boards 7. Even if slight unevenness occurs, this prevents misalignment at the joints ε between the ceiling panels 9. This prevents cracks from occurring in the decorative finish applied to the underside of the ceiling panels 9, thereby preventing a deterioration in the design of the second ceiling 10.

[0041] The light source 8 is a lighting fixture that emits light linearly, such as an LED line lighting fixture. The light source 8 is an elongated body arranged over the entire length of the groove 77 of the indirect lighting structure 1a. The light source 8 is connected to a power source at one end in the longitudinal direction, allowing it to emit light along its entire length. The cross section of the light source 8 is approximately rectangular, and includes a flat lower surface 83, an upper surface 82 parallel to the lower surface 83, a first surface 80 that faces the tip inclined portion 72 when placed in the groove 77, and a second surface 81 that faces the rear end 5a. The height of the light source 8 is 35 mm, and the width of the light source 8 is 85 mm. The second surface 81 and the upper surface 82 of the light source 8 are connected so that the corners are curved. The second surface 81 of the light source 8 emits light with a higher luminous intensity than the first surface 80. By making the second surface 81 emit light with a higher luminous intensity than the first surface 80, it is possible to prevent strong light from being directly irradiated onto the first ceiling 3a, and to provide softer indirect lighting. Note that the first surface 80 does not necessarily have to emit light.

[0042] The height of the raised surface 75 of the groove portion 77 of the lighting base plate 7 is 35 mm, which is the same as the height of the light source 8 (35 mm). Therefore, the light source 8 is placed completely within the groove portion 77, which allows the light source 8 to be reliably hidden from heights lower than the lighting base plate 7, resulting in a softer ambience of illumination. Furthermore, the light source 8 is not fixed to the lighting base plate 7, but is simply placed on the bottom surface 78 of the groove portion 77. This allows the light source 8 to move in the width direction of the groove portion 77, and the position of the light source 8 can be adjusted within the width of the groove portion 77 in the direction approaching the leading edge inclined portion 72 and the direction approaching the rear end portion 5a.

[0043] As described above, in the indirect lighting structure 1a of this embodiment, the first ceiling 3a is formed in a mountain shape by the first inclined surface 30 and the second inclined surface 31, but the curved connecting surface 32 at the top creates a smooth first ceiling 3a. Since no equipment that would cause unevenness is installed on the first ceiling 3a, light from the light source 8 can be smoothly transmitted farther. Furthermore, the lighting base board 7 is firmly fixed to the structural frame via the holder 6 and the support member, allowing the lighting base board 7 to be extended in a direction intersecting the rear end 5a. This allows the rear end 5a to be positioned deep within the space formed between the first ceiling 3a and the lighting base board 7, making the rear end 5a and the light source 8 less visible from the indoor space 2 below. Furthermore, the inclined tip portion 72 of the lighting base board 7 conceals the light source 8 while thinning the tip, creating a sharp impression and improving design. Furthermore, by making the inclined tip portion 72 side lighter, the lighting base board 7 can be extended even longer.

[0044] Second Embodiment Next, a second embodiment of the indirect lighting structure of the present invention will be described with reference to Figures 7 and 8. Note that the same components as those in the first embodiment are denoted by the same reference numerals and will not be described again. As with the first embodiment, the indirect lighting structure 1b of the second embodiment is a structure to be installed in an indoor space 2 of a building such as a house, and illuminates the indoor space 2 by irradiating light onto a first ceiling 3b covering the indoor space 2. Unlike the first embodiment, the indirect lighting structure 1b of the second embodiment has a flat first ceiling 3b.

[0045] As shown in Figures 7 and 8, the indirect lighting structure 1b comprises a first ceiling 3b, a rear end portion 5b extending downward from the first ceiling 3b, an L-angle-shaped holder 6 extending downward and protruding along the rear end portion 5b, a lighting base plate 7 fixed to the holder 6, and a light source 8 arranged in a groove portion 77 formed in the lighting base plate 7.

[0046] The first ceiling 3b is horizontally formed by attaching panels such as gypsum board to rough girders suspended below the horizontal beams 49. The underside of the panels forming the first ceiling 3b is coated with a plastering decorative finish 35. In this embodiment, the first ceiling 3b is the first-floor ceiling of a two-story building, and the horizontal beams 49 are floor beams supporting the second-floor floor. The first ceiling 3b is completely free of any fixtures that would create irregularities, such as lighting fixtures, fire alarms, and various sensors, or air conditioning equipment. This provides the first ceiling 3b with a completely smooth surface, allowing light irradiated onto the first ceiling 3b to extend far from the light source 8 without being blocked. Note that the statement that the first ceiling 3b has a completely smooth surface does not exclude slight depressions at the joints between the panels forming the first ceiling 3b or slight irregularities inherent in the nature of the decorative finish 35, as in the first embodiment.

[0047] The rear end portion 5b is a surface material such as plasterboard that is fixed to a reinforcing material 50 that is supported by a horizontal beam 49. Note that the "structural body" of the present invention corresponds to the horizontal beam 49 in this embodiment, and the "support member" of the present invention corresponds to the reinforcing material 50 in this embodiment. The rear end portion 5b is planar and extends downward from the lower end of the first ceiling 3b. While the rear end portion 5b of this embodiment is formed from plasterboard, it may also be formed by attaching a decorative material (not shown), for example.

[0048] The retainer 6 has the same configuration as in the first embodiment, and therefore its description will be omitted. The retainer 6 has a mounting portion 60 and an arm portion 61 formed from a steel angle bar, and a reinforcing plate 62 that reinforces the mounting portion 60 and the arm portion 61. The retainer 6 is fixed to the reinforcing material 50 by inserting a screw 66 into a screw insertion hole 63 provided in the mounting portion 60 and driving it into the reinforcing material 50. The reinforcing material 50 is positioned above the panel material that forms the first ceiling 3b, and the mounting portion 60 of the retainer 6 is fixed by driving the screw 66 into the horizontal beam through the screw insertion hole 63 while abutting against the side of the reinforcing material 50 with the gypsum board that forms the rear end portion 5b sandwiched between them. The mounting portion 60 of the retainer 6 extends below the first ceiling 3b along the rear end portion 5b, and the arm portion 61 protrudes downward at a distance from the first ceiling 3b in a direction B that intersects with the rear end portion 5b. A base end fixing portion 70 of the lighting base plate 7 is fixed with a bolt to the arm portion 61 of the holder 6. The base end fixing portion 70, groove forming portion 71, and tip inclined portion 72 of the lighting base plate 7 have the same configuration as in the first embodiment, so their description will be omitted. Furthermore, the light source 8 installed in the groove portion 77 of the groove forming portion 71 has the same configuration as in the first embodiment, so their description will be omitted.

[0049] A plurality of ceiling panels 9 are attached to the underside of the lighting base plate 7 in a direction A parallel to the rear end 5b to form a second ceiling 10. The joints γ between the lighting base plates 7 and the joints ε between the ceiling panels 9 are offset from each other in the direction A parallel to the rear end 5b. A third ceiling 11 is formed flush with the second ceiling 10 and extends from the lower end of the rear end 5b in the direction opposite to the protrusion direction of the arm 61. The third ceiling 11 is fixed to a joist 12 supported by hanging bolts hanging from the horizontal beams and is formed flush and horizontal with the second ceiling 10. The formation of the third ceiling 11 in this way eliminates the need to align the rear end 5b with the exterior wall or partition wall, thereby increasing the flexibility in the location of the rear end 5b and the lighting base plate 7, and improving the design flexibility in the location of the indirect lighting structure 1b.

[0050] It goes without saying that the embodiments of the present invention are not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the concept of the present invention.

[0051] This specification discloses the following techniques: [Appendix 1] an indirect lighting structure comprising: a first ceiling; a holder having a rear end portion formed below the first ceiling; an attachment portion fixed above the first ceiling to a support member fixed to a structural body and extending below the first ceiling along the rear end portion; and an arm portion protruding from the attachment portion in a direction intersecting the rear end portion below and spaced apart from the first ceiling; a base end fixing portion fixed along the arm portion; a groove forming portion extending further from the base end fixing portion and having a groove portion formed on its upper surface parallel to the rear end portion; and a tip inclined portion having a rising surface rising from the bottom surface of the groove portion and a downwardly sloping surface from the upper end of the rising surface to the tip, the lighting base plate serving as a base for a second ceiling whose underside is lower than the first ceiling; and a light source arranged in the groove portion.

[0052] According to Supplementary Note 1, the mounting portion of the holder is fixed to a support member fixed to the structural frame above the first ceiling, and the arm of the holder secures the base end fixing portion of the lighting base plate. Therefore, the lighting base plate is firmly fixed to the structural frame via the holder and the support member. The groove-forming portion and the inclined tip portion can be further extended from the base end fixing portion, allowing the lighting base plate to be extended in a direction intersecting the rear end. Therefore, the rear end is positioned deep within the space formed between the first ceiling and the lighting base plate, making the rear end and the light source less visible from the indoor space below the second ceiling, improving the design. Furthermore, the inclined tip portion of the lighting base plate conceals the light source with its raised surface, and the inclined surface is formed downward toward the tip, allowing the tip to be thinner than the overall thickness of the lighting base plate, creating a sharp impression. Furthermore, by providing the tip inclined portion, the tip inclined portion side can be made lighter than the base end fixing portion side, and the lighting base plate can be extended longer in the direction intersecting with the rear end portion.

[0053] [Appendix 2] In the indirect lighting structure of Appendix 1, a plurality of the lighting base plates are provided, and the lighting base plates are arranged in a line parallel to the rear end portion, and the second ceiling is formed by attaching a plurality of ceiling plates to the underside of the lighting base plate in a line parallel to the rear end portion, and the joints between the lighting base plates and the joints between the ceiling plates are arranged so as to be offset from each other in a direction parallel to the rear end portion.

[0054] According to Appendix 2, the lighting base plates are arranged in a direction parallel to the rear end, the ceiling panels are attached to the underside of the lighting base plates in a direction parallel to the rear end, and the joints between the lighting base plates and the joints between the ceiling panels are offset from each other in a direction parallel to the rear end, so the ceiling panels can prevent the lighting base plates from being offset in the vertical direction, preventing a decrease in the design of the second ceiling.

[0055] [Appendix 3] In the indirect lighting structure of Appendix 2, the lighting base plate has a vertical through hole and is fixed to the arm portion by a base fixing bolt inserted into the through hole from below, and the lower end of the through hole is enlarged to form a deep countersunk hole into which the head of the base fixing bolt can fit.

[0056] According to Appendix 3, a deep countersunk hole is formed at the lower end of the through hole that passes vertically through the lighting base plate, so that the head of the base fixing bolt for fixing the lighting base plate to the arm portion does not protrude from the underside of the lighting base plate, and the ceiling plate can be attached to the underside of the lighting base plate with precision, resulting in a smooth finish to the second ceiling.

[0057] [Appendix 4] The indirect lighting structure of Supplementary Note 1 further comprises a third ceiling extending from a lower end of the rear end portion in a direction opposite to the protruding direction of the arm portion and flush with the second ceiling.

[0058] According to Appendix 4, the third ceiling further includes a third ceiling extending from the lower end of the rear end, flush with the second ceiling, in the opposite direction to the protruding direction of the arm, and there is no need to match the position of the rear end with the exterior wall or partition wall, which increases the freedom of the position at which the rear end and lighting base plate are installed, and improves the design freedom of the position at which indirect lighting is formed.

[0059] [Appendix 5] In the indirect lighting structure of Supplementary Note 1, the light source is placed on the bottom surface of the groove so as to be movable in the width direction of the groove.

[0060] According to Appendix 5, the light source is placed on the bottom surface of the groove portion and is movable in the width direction of the groove portion, so that by adjusting the position of the light source, the direction and illuminance of the light irradiated onto the first ceiling can be adjusted, and therefore, it can be easily adjusted according to various factors such as the shape of the first ceiling and the user's preferences.

[0061] [Appendix 6] In the indirect lighting structure of Supplementary Note 1, the height of the light source is equal to the height of the rising surface of the tip inclined portion.

[0062] According to Appendix 6, since the height of the light source is equal to the height of the rising surface of the tip inclined portion, the light source can be reliably hidden from heights lower than the lighting base plate, creating a soft lighting atmosphere.

[0063] [Appendix 7] In the indirect lighting structure of Appendix 1, the light source has a first surface facing the tip inclined portion and a second surface facing the rear end portion, and the second surface emits light with a higher luminous intensity than the first surface.

[0064] According to Appendix 7, the second surface facing the rear end of the light source emits light with a higher luminous intensity than the first surface facing the tip inclined portion, thereby preventing strong light from being directly irradiated onto the first ceiling and providing softer indirect lighting.

[0065] [Appendix 8] In the indirect lighting structure of Appendix 1, the first ceiling has a first inclined surface that rises in a direction away from the rear end, a second inclined surface that descends in a direction away from the first inclined surface, and a connecting surface that connects the first inclined surface and the second inclined surface, and the connecting surface is a curved surface that smoothly connects to the upper ends of the first inclined surface and the second inclined surface and bulges upward, and the curved surface is formed below the ridge beam.

[0066] According to Appendix 8, the first ceiling is a gable-shaped sloped ceiling, but the connecting surface connecting the first and second sloped surfaces is a curved surface that is smoothly connected, and since this curved surface is formed below the ridge beam, there is nothing on the first ceiling that blocks light, and no bends are formed on the first ceiling, so the illuminance of the light irradiated onto the first ceiling is smoothly continuous, allowing the light from the light source to reach farther and the entire indoor space below the first ceiling to be enveloped in soft light with minimal lighting.

[0067] [Appendix 9] In the indirect lighting structure of Supplementary Note 8, the second inclined surface is formed so that an end portion thereof away from the connecting surface extends to a position lower than the lighting base plate.

[0068] According to Supplementary Note 9, the end of the second inclined surface away from the connection surface is formed to extend to a position lower than the lighting base plate, so the first ceiling can be extended longer and the light from the light source can be made to reach a longer distance smoothly. Also, because the position of the second inclined surface farthest from the light source is formed lower than the lighting base plate, it is possible to more effectively prevent the light source from being directly visible. [Industrial Applicability]

[0069] The indirect lighting structure according to the present invention is suitable as an indirect lighting structure for illuminating an indoor space of a residential building such as a house. [Explanation of symbols]

[0070] 1a, 1b...indirect lighting structure, 3a, 3b...first ceiling, 5a, 5b...rear end, 6...holder, 7...lighting base board, 8...light source, 9...ceiling board, 10...second ceiling, 11...third ceiling, 30...first inclined surface, 31...second inclined surface, 32...connecting surface, 40...ridge beam, 47...column (structural body), 48...girder beam (supporting member), 49...horizontal beam (structural body), 50...horizontal reinforcement (supporting member), 60...mounting portion, 61...arm portion, 64...base fixing bolt, 68...head, 70...base end fixing portion, 71...groove forming portion, 72...tip inclined portion, 74...deep countersunk hole, 75...rising surface, 76...inclined surface, 77...groove portion, 78...bottom surface, 80...first surface, 81...second surface.

Claims

1. The first ceiling and a rear end portion formed downward from the first ceiling; a holder fixed to a support member fixed to a structural body, the holder having a mounting portion extending downward along the rear end portion of the first ceiling, and an arm portion projecting from the mounting portion in a direction intersecting the rear end portion below and spaced apart from the first ceiling; a base end fixing portion fixed along the arm portion; a groove forming portion extending further from the base end fixing portion and having a groove formed at the rear end portion on the upper surface; and a tip inclined portion having a rising surface rising from the bottom surface of the groove portion and a sloped surface that slopes downward from the upper end of the rising surface to the tip, the bottom surface of which serves as the base for a second ceiling whose lower surface is lower than the first ceiling; a light source disposed in the groove; An indirect lighting structure comprising:

2. a plurality of the illumination base plates are provided, and the illumination base plates are arranged in a direction parallel to the rear end portion; the second ceiling is formed by attaching a plurality of ceiling plates to the underside of the lighting base plate in a direction parallel to the rear end portion, The indirect lighting structure according to claim 1 , wherein the joints between the lighting base plates and the joints between the ceiling plates are arranged so as to be offset from each other in a direction parallel to the rear end portion.

3. the lighting base plate has a vertical through-hole and is fixed to the arm portion by a base fixing bolt inserted into the through-hole from below, The indirect lighting structure according to claim 2 , wherein the lower end of the through hole is enlarged to form a deep countersunk hole into which the head of the base fixing bolt is fitted.

4. The indirect lighting structure according to claim 1 , further comprising a third ceiling extending from a lower end of the rear end portion in a direction opposite to the protruding direction of the arm portion and flush with the second ceiling.

5. 2. The indirect lighting structure according to claim 1, wherein the light source is placed on the bottom surface of the groove so as to be movable in the width direction of the groove.

6. The indirect lighting structure according to claim 1 , wherein the height of the light source is equal to the height of the rising surface of the inclined tip portion.

7. the light source has a first surface facing the tip inclined portion and a second surface facing the rear end portion, The indirect lighting structure according to claim 1 , wherein the second surface emits light with a higher luminous intensity than the first surface.

8. the first ceiling has a first inclined surface that rises in a direction away from the rear end portion, a second inclined surface that falls in a direction away from the first inclined surface, and a connecting surface that connects the first inclined surface and the second inclined surface, the connecting surface is a curved surface that smoothly connects to an upper end of the first inclined surface and an upper end of the second inclined surface and bulges upward, The indirect lighting structure according to claim 1 , wherein the connecting surface is formed below the ridge beam.

9. The indirect lighting structure according to claim 8 , wherein the second inclined surface is formed so that an end thereof away from the connecting surface extends to a position lower than the lighting base plate.

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