JP2013033750A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device attaining uniform plane illumination with a fluorescent tube and dead bodies of insects or the like free from being visually recognized from the lower side, even if it is made thin in size.SOLUTION: The lighting device 1 has a light source 4 and an illumination cover 2 arranged to cover the light source 4, and the illumination cover 2 has a frame 5, a first light diffusion member 6 and a second light diffusion member 7. The frame 5 has an opening 5a for passing through light emitted from the light source 4, and the end part at a light source 4 side of the opening 5a and the other end part at the opposite side are respectively covered with the first light diffusion member 6 and the second light diffusion member 7. The first and the second light diffusion members 6, 7 are made of a glass fiber sheet, with a total light transmittance of the first light diffusion member 6 of 80% or more and a haze value of 70% or more, and a total light transmittance of the second light diffusion member 7 of 40% or more and a haze value of 80% or more. A sealed space is formed with the frame 5, the first light diffusion member 6, and the second light diffusion member 7.

Description

  The present invention relates to a lighting device.

2. Description of the Related Art Conventionally, in galleries, entrances, and the like, lighting devices that realize surface lighting with a large number of fluorescent tubes attached to a ceiling surface and a lighting cover are used. In addition, there has been proposed an illumination device having a configuration for preventing a decrease in aesthetics caused by accumulation of dead bodies such as insects that have entered the illumination device on the illumination cover (Patent Document 1). Patent Document 1 describes an illuminating device including an illumination cover in which a light-transmitting sheet is attached to the fluorescent tube side of a frame and a light diffusion sheet is attached to the opposite side. In this lighting cover, a sealed space is formed by the frame, the translucent sheet, and the light diffusion sheet. The insect carcasses that have entered the lighting device do not collect in the lighting cover, but accumulate on the translucent sheet. For this reason, when the illuminating device is viewed from below, the corpse of insects is difficult to be visually recognized, so that the beauty is maintained.
JP 2006-209978 A

  In the illumination device as described above, it is required to reduce the distance between the fluorescent tube and the lower surface of the illumination cover for the convenience of the structure of the building. However, if this distance is short, the fluorescent tube is easily visible from below and unevenness in light emission occurs, and uniform surface illumination is not realized. In addition, the thinning of the lighting cover makes it easier for insect corpses to be projected onto the lighting cover.

  The present invention has been made in view of the above problems, and provides an illuminating device that realizes uniform surface illumination without being visible from the bottom of a fluorescent tube or a dead body such as an insect even if the thickness is reduced. The purpose is to do.

  An illumination device according to the present invention includes a light source and an illumination cover arranged to cover the light source, and the illumination cover includes a frame frame, a first light diffusion member, and a second light diffusion member. The frame has an opening for allowing light emitted from the light source to pass through, and the end of the opening on the light source side is covered with the first light diffusion member, and is opposite to the light source side of the opening. The other end of the glass fiber sheet is covered with a second light diffusing member, and the first light diffusing member is made of a glass fiber sheet and a glass fiber sheet having a resin coating layer for covering the glass fiber cloth. The light diffusing member is composed of a glass fiber woven fabric and a glass fiber sheet having a resin coating layer that covers the glass fiber woven fabric, the total light transmittance of the first light diffusing member is 80% or more, and the haze value is 70% or more. The total light transmittance of the second light diffusing member is 40% or more. , And the haze value is 80% or more, and a framework, a first light diffusing member, that the enclosed space is formed by the second light diffusing member.

  In the illumination device of the present invention, both ends of the opening of the frame frame are covered with the first and second light diffusing members, and these light diffusing members transmit light and diffuse incident light. Since the total light transmittance of the first light diffusing member is 80% or more and the total light transmittance of the second light diffusing member is 40% or more, the light emitted from the light source passes through the opening of the frame. Even when the light passes through the first and second light diffusing members, a sufficient amount of light is secured for the lighting device. In addition, since the first and second light diffusing members have light diffusibility, the light passing through the opening is diffused by both the first and second light diffusing members. Furthermore, since the haze value of the second light diffusing member is 80% or more, even if the distance between the light source and the second light diffusing member located on the lower surface of the lighting cover is short, it is between the lighting cover and the light source. Carcasses such as insects that accumulate and the shape of the light source are difficult to see from below. Therefore, the aesthetic appearance of the lighting device is maintained, and uniform surface illumination without unevenness is realized. The total light transmittance is a ratio of light transmitted through the light diffusing member out of light incident on the light diffusing member. The haze value is a ratio of diffuse transmittance to total light transmittance. That is, as the haze value is larger, more incident light is diffused. These transmittances are measured according to the method defined in JIS K 7105.

  Further, since the frame frame, the first light diffusing member, and the second light diffusing member form a sealed space, insects and the like do not enter the sealed space. For this reason, dead bodies, such as an insect, do not accumulate on the 2nd light diffusing member, and aesthetics are maintained. Even when an insect or the like enters the lighting device, the dead body is accumulated on the first light diffusion member located on the upper surface of the lighting cover. Since the light from the light source is diffused by the first and second light diffusing members, the shadows of dead bodies such as insects on the first light diffusing member are hardly visible from below. Furthermore, since the glass fiber sheet which comprises a 2nd light-diffusion member consists of a glass fiber fabric and the resin coating layer which coat | covers this, it has nonflammability and the fire prevention performance of an illuminating device improves.

  Further, since the haze value of the first light diffusing member is 70% or more, the light from the light source is sufficiently diffused, and the shadow of the insect dead body and the shape of the light source are difficult to be visually recognized.

  Moreover, since the 1st light-diffusion member also consists of a nonflammable glass fiber sheet in addition to the 2nd light-diffusion member, the fireproof performance of an illuminating device improves further.

  The illumination device according to the present invention further includes a fixed frame arranged so that the relative position to the light source is fixed, and the fixed frame and the frame frame have a rectangular outer shape and are paired with each other. The first and second connecting rods are connected to each other by the first and second connecting rods, and the ends of the paired first connecting rods are respectively two opposite sides and one other side of the two opposite sides of the fixed frame. Are attached to the first portion in the vicinity of the corner portion so as to be rotatable about the opposing direction of the two opposing sides, and the other end portions of the pair of first connecting rods are respectively connected to the frame frame. Each of the two sides facing each other is attached to a first portion in the vicinity of the corner portion composed of two sides facing each other and the other side so as to be rotatable about the facing direction as a pair. The ends of the two connecting rods are two opposite sides of the fixed frame. In each of the second parts, the distance from the corner part is more distant than the first part of the fixed frame, and the second frame is attached to the second part so as to be rotatable about the opposing direction. Each end is attached to each of two opposite sides of the frame frame so as to be rotatable about the opposing direction as a second portion that is more distant from the corner than the first portion of the frame frame. The length of the second connecting rod is longer than the length of the first connecting rod.

  Since the second part of the frame frame is rotatably connected to the other end of the second connecting rod, the lighting cover can be opened and closed by rotating the frame frame around this connecting part. It becomes. Moreover, since the edge part of the 2nd connection rod is connected with the 2nd part of a fixed frame so that rotation is possible, the 2nd connection rod can be rotated centering on this connection part. By this rotation, the other end of the second connecting rod, which is the axis of rotation of the frame, moves in a direction away from the corner of the fixed frame while drawing an arc around the end. Thus, even when a plurality of lighting devices are arranged adjacent to each other without a gap, the frame frame can be rotated without interfering with the adjacent lighting devices when the lighting cover is opened and closed.

  Furthermore, the end portion of the first connecting rod is rotatably connected to the first portion of the fixed frame, and the first portion of the frame frame is rotatable to the other end portion of the first connecting rod. Therefore, the distance between the first portion of the fixed frame and the first portion of the frame frame is defined by the distance between the end portion and the other end portion of the first connecting rod. Thereby, the rotation angle of the 2nd connection rod with respect to a fixed frame and the rotation angle of the frame frame with respect to a 2nd connection rod are matched uniquely. In addition, since the first connecting rod is shorter than the second connecting rod, the illumination cover can be opened so that the distance between the fixed frame and the frame frame increases as the distance from the corner of the fixed frame increases. Therefore, since the trajectory of rotation of the frame frame is constant when the lighting cover is opened and closed, the lighting cover does not perform an unexpected operation of the operator when the lighting cover is opened and closed. Therefore, generation and breakage of wrinkles due to application of a large force to the first and second light diffusing members can be prevented, which contributes to the realization of uniform surface illumination. Furthermore, the safety of work involving opening and closing of the lighting cover is improved.

  In the lighting device according to the present invention, the other end of the first connecting rod and the other end of the second connecting rod are attached to the frame frame via a connecting member, It is preferable to be connected to the surface of the frame frame that faces the fixed frame. In this case, the first and second connecting rods are collectively connected to the frame frame via the connecting member, so that the connection strength can be ensured. Further, since the second light diffusing member is provided on the side of the frame frame opposite to the surface facing the fixed frame, the connecting portion between the first and second connecting rods and the frame frame is the second It does not interfere with the light diffusing member. For this reason, when providing the connection part with the 1st and 2nd connection rod in a frame, the process of opening a hole in the 1st light diffusion member of the opening part of the 2nd light diffusion member or a frame is unnecessary. Thus, a complete sealed space can be formed by the frame frame, the first light diffusing member, and the second light diffusing member. Furthermore, when the lighting cover is opened and closed, it is possible to suppress the application of a force that deforms the frame at the connecting portion. No uniform surface illumination is achieved.

Moreover, in the illuminating device which concerns on this invention, it is preferable that the cross-sectional shape of the connection member seen from the direction parallel to the edge of the frame frame to which the connection member is connected is a substantially L shape. In this case,
The first and second connecting rods are more preferably connected to the frame frame while ensuring connection strength.

  ADVANTAGE OF THE INVENTION According to this invention, even if it makes it thin, it becomes possible to provide the illuminating device which implement | achieves uniform surface illumination, without observing dead bodies, such as a fluorescent tube and an insect, from the downward direction.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an illumination device according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a schematic perspective view of the lighting device of the present embodiment provided on the ceiling. FIG. 1A is a schematic perspective view of the lighting cover closed, and FIG. 1B is a schematic perspective view of the lighting cover opened. FIG. 2 is a schematic bottom view of the illumination device of the present embodiment. FIG. 3 is a schematic cross-sectional view taken along the line II of FIG. The lighting device 1 includes a lighting cover 2, a fixed frame 3, and a light source 4. In order to realize surface illumination of a space in which the illumination device 1 is provided, for example, a large number of illumination devices 1 are disposed adjacent to the ceiling surface.

  The illumination cover 2 is disposed so as to cover the light source 4 and includes a frame 5, a first light diffusion member 6, and a second light diffusion member 7. The frame frame 5 has a substantially rectangular outer shape and has an opening 5a for allowing light emitted from the light source 4 to pass therethrough. The end of the opening 5 a on the light source 4 side is covered with the first light diffusing member 6, and the other end of the opening 5 a opposite to the light source 4 is covered with the second light diffusing member 7. Yes. Accordingly, the light emitted from the light source 4 passes through the first light diffusion member 6 and the second light diffusion member 7 when passing through the opening of the frame 5. In addition, since a sealed space is formed by the frame 5, the first light diffusing member 6, and the second light diffusing member 7, insects and the like do not enter the inside of the illumination cover 2. For this reason, it can prevent that dead bodies, such as an insect, accumulate on the 2nd light-diffusion member 7. FIG.

  The first light diffusing member 6 is a sheet-like member having translucency and light diffusibility, and is attached to the frame frame 5 so as to cover the end of the opening 5a of the frame frame 5 on the light source 4 side. The first light diffusing member 6 is attached to the frame frame 5 using screws, for example, or is attached to the frame frame 5 using double-sided tape (not shown). Since the total light transmittance of the first light diffusing member 6 is 80% or more, even when the light emitted from the light source 4 passes through the first light diffusing member 6, a sufficient amount of light is secured as an illumination device. Is done. In addition, since the first light diffusing member 6 has light diffusibility, the light passing through the opening 5 a is diffused when passing through the first light diffusing member 6. For this reason, even if dead bodies such as insects that have entered between the illumination cover 2 and the light source 4 accumulate on the first light diffusion member 6, the shadows of dead bodies such as insects are difficult to be seen from below. Moreover, the light diffusibility of the first light diffusing member makes it difficult to visually recognize the shape of the light source 4 from below. Therefore, the aesthetic appearance of the lighting device is maintained, and uniform surface illumination without unevenness is realized. The haze value of the first light diffusing member 6 is preferably 70% or more. When the haze value is 70% or more, the light from the light source 4 is sufficiently diffused, so that the shadow of the insect dead body and the shape of the light source are more difficult to be visually recognized.

  The first light diffusion member 6 may be a synthetic resin sheet, but is preferably made of a glass fiber sheet. The glass fiber sheet has a glass fiber fabric and a resin coating layer that covers the glass fiber fabric. When the 1st light-diffusion member 6 consists of glass fiber sheets, since the glass fiber sheet has nonflammability, the fireproof performance of the illuminating device 1 improves.

  The second light diffusing member 7 is a sheet-like member having translucency and light diffusibility, and is attached by screws 5b so as to cover the other end of the opening 5a of the frame 5 opposite to the light source 4 side. It is attached to the frame 5 (see FIG. 6). Since the total light transmittance of the second light diffusing member 7 is 40% or more, even when the light emitted from the light source 4 passes through the second light diffusing member 7, a sufficient amount of light is secured as an illumination device. Is done. In order to obtain a sufficient amount of light for the lighting device, the total light transmittance of the second light diffusing member is more preferably 50% or more. Further, since the second light diffusing member 7 has light diffusibility and has a haze value of 80% or more, the illumination cover 2 and the light source even if the distance between the light source 4 and the second light diffusing member 7 is short. The shape of the corpse such as insects and the light source accumulated between 4 and 4 is difficult to be seen from below. Therefore, the aesthetic appearance of the lighting device is maintained, and uniform surface illumination without unevenness is realized.

  FIG. 4 is a schematic perspective view of an example of a glass fiber sheet used for the second light diffusing member 7. The glass fiber sheet 30 includes a glass fiber fabric 31 and a resin coating layer 34. The glass fiber fabric 31 is covered with a resin coating layer 34.

The glass fiber fabric 31 is obtained by weaving a glass fiber bundle. For example, the glass fiber fabric 31 is formed by plain weaving warps 32 and wefts 33. The weaving method is not limited to plain weaving, and for example, double weaving, satin weaving, twill weaving and the like are employed. From the viewpoint of light diffusibility, translucency, and tensile strength of the glass fiber sheet as the light diffusion member, the mass per unit area of the glass fiber fabric 31 is preferably 100 to 300 g / m ² , and the thickness is It is preferable that it is 100-300 micrometers. The air permeability of the glass fiber fabric 31 is preferably 10 cm ³ / cm ² / sec or less. Although the composition of the glass which is a raw material of glass fiber is not specifically limited, For example, E glass is used.

The resin coating layer 34 is a layer formed to cover the warp yarns 32 and the weft yarns 33 of the glass fiber fabric 31 by impregnating the resin composition into the glass fiber fabric 31 and solidifying the resin composition. As a preferable first embodiment for forming the resin coating layer 34, it is possible to impregnate a glass fiber fabric 31 with a fluororesin or silicone resin resin composition containing hollow glass beads to form a sheet. By using these resin compositions, the translucency and light diffusibility of the glass fiber sheet 30 can be adjusted, and nonflammability can be improved. Further, as the resin composition of the resin coating layer 34, polyvinyl chloride resin, vinyl ester resin, acrylic resin, polyurethane resin, polyester resin, polyethylene resin, polypropylene resin, and the like can be used. In this case, the mass per unit area of the resin composition is preferably 50 to 300 g / m ² from the viewpoint of light diffusibility, translucency, and flame retardancy.

Further, as a preferred second embodiment for forming the resin coating layer 34, a glass fiber fabric is impregnated with a resin having a refractive index substantially equal to the refractive index of the glass composition of the glass fiber fabric 31 to form a sheet. It can be mentioned that the resin coating layer 34 is formed by further providing a bead layer on one side or both sides. In this case, the resin is preferably a polyvinyl chloride resin or a vinyl ester resin. The bead layer is a layer in which a large number of fine beads are mixed with a resin such as polyvinyl chloride resin, vinyl ester resin, and acrylic resin and sufficiently dispersed, and then a film of the resin containing beads is formed. A large number of beads dispersed in the bead layer diffuse light incident on the glass fiber sheet 30 at a high rate to improve the light diffusibility of the glass fiber sheet 30, and the bead layer on the side opposite to the light source has an antiglare property. Demonstrate. The shape of the beads is, for example, spherical, and the particle diameter of the beads is preferably a fine one of about 1 to 30 μm, for example. The material of the beads is, for example, an inorganic material such as silica or an organic material such as acrylic. In this case, the resin amount per unit area of the resin coating layer is preferably 50 to 300 g / m ² from the viewpoints of light diffusibility, translucency, and flame retardancy.

On the other hand, the first light diffusing member 6 is preferably made of a glass fiber sheet. Similar to the glass fiber sheet 30 used in the second light diffusing member 7 shown in the schematic perspective view of FIG. 31 and the resin coating layer 34, and the glass fiber fabric 31 is preferably covered with the resin coating layer 34. In this case, the mass per unit area of the glass fiber fabric is preferably 50 to 200 g / m ² from the viewpoint of light diffusibility and translucency, and the resin coating layer 34 is formed in the second light diffusing member 7. It is preferable that the resin layer is formed according to the second embodiment. From the viewpoint of light diffusibility, translucency, and flame retardancy, the resin amount per unit area of the resin coating layer is 30 to 200 g / m ^2. preferable.

  The fixed frame 3 is a member having an approximately rectangular outer shape and an opening through which light emitted from the light source 4 passes. The fixed frame 3 is arranged so that the relative position to the light source 4 is fixed. For example, the fixed frame 3 is attached to the ceiling 20 via the attachment member 3a. Since the light source 4 is also attached to the ceiling 20, the relative position between the fixed frame 3 and the light source 4 is fixed.

  The light source 4 is for emitting light for illumination, and is composed of, for example, a fluorescent tube. A large number of light sources 4 are arranged on the ceiling 20.

  The fixed frame 3 and the frame frame 5 are connected to each other by a first connecting rod 8 and a second connecting rod 9 that make a pair. FIG. 5 is an enlarged view showing a connecting portion between the fixed frame 3 and the frame 5. 6 is a cross-sectional view taken along the line II-II in FIG. As shown in FIG. 5, the length of the second connecting rod 9 is longer than the length of the first connecting rod 8.

  Each of the end portions 8a of the pair of first connecting rods 8 is connected in the vicinity of the corner 3b composed of the two opposite sides and the other one side of each of the two opposite sides of the fixed frame 3. It is attached via the member 11. More specifically, the end portion 8a of the first connecting rod 8 is attached to the first portion 11a of the connecting member 11 so as to be rotatable about a direction D that is an opposing direction of the two opposing sides. . Each of the first portions 11a of the connecting member 11 is located in the vicinity of each corner 3b of the two opposite sides of the fixed frame 3.

  Each of the other end portions 8b of the paired first connecting rods 8 is in the vicinity of the corner portion 5c formed by the two opposite sides and the other one side of each of the two opposite sides of the frame 5. It is attached via the connecting member 10. More specifically, the other end 8b of the first connecting rod 8 is attached to the first portion 10a of the connecting member 10 so as to be rotatable about the direction D as an axis. Each of the first portions 10a of the connecting member 10 is located in the vicinity of each corner 5c of the two opposite sides of the frame 5.

  The end portions 9 a of the paired second connecting rods 9 are respectively attached to the two opposite sides of the fixed frame 3 via connection members 11. More specifically, the end 9a of the second connecting rod 9 is attached to the second portion 11b of the connecting member 11 so as to be rotatable about the direction D as an axis. The second portion 11b of the connection member 11 is disposed at a distance from the corner 3b of the fixed frame 3 that is greater than that of the first portion 11a.

  The other end portions 9b of the paired second connecting rods 9 are respectively attached to the two opposite sides of the frame 5 via the connecting members 10. More specifically, the other end 9b of the second connecting rod 9 is attached to the second portion 10b of the connecting member 10 so as to be rotatable about the direction D as an axis. The second portion 10b of the connecting member 10 is arranged at a distance from the corner portion 5c of the frame 5 as compared with the first portion 10a.

  FIG. 7 is a view showing a state in which the illumination cover 2 of the illumination device 1 shown in FIG. 3 is opened. FIG. 8 is an enlarged view showing a connecting portion between the fixed frame 3 and the frame frame 5 in a state in which the lighting cover 2 is opened. Since the second portion 10b of the connecting member 10 attached to the frame 5 is rotatably connected to the other end 9b of the second connecting rod 9, the frame 5 is attached to the connecting portion 9 as an axis. By turning, the illumination cover 2 can be opened and closed.

  In addition, the end 9a of the second connecting rod 9 is rotatably connected to the second portion 11b of the connecting member 11 attached to the fixed frame 3, so that the second portion 11b is used as an axis. The connecting rod 9 can be rotated. By this rotation, the other end 9b of the second connecting rod 9 serving as the axis of rotation of the frame 5 is drawn away from the corner 3b of the fixed frame 3 while drawing an arc around the end 9a. (Refer to FIG. 5 and FIG. 8 for comparison). Thereby, even when a plurality of lighting devices 1 are arranged adjacent to each other without a gap, the frame 5 can be rotated without interfering with the adjacent lighting devices 1 when the lighting cover 2 is opened and closed. Become.

  The end portion 8 a of the first connecting rod 8 is rotatably connected to the first portion 11 a of the connecting member 11, and the first portion 10 a of the connecting member 10 is the other end of the first connecting rod 8. Since the portion 8b is pivotably connected, the distance between the first portion 10a of the connecting member 10 and the first portion 11a of the connecting member 11 is the end portion 8a of the first connecting rod 8 and the other end. It is prescribed | regulated by the distance with the part 8b (refer FIG.5 and FIG.8 comparison). Thereby, the rotation angle of the 2nd connection rod 9 with respect to the fixed frame 3 and the rotation angle of the frame frame 5 with respect to the 2nd connection rod 9 are matched uniquely. Further, since the first connecting rod 8 is shorter than the second connecting rod 9, the lighting cover 2 is opened so that the distance between the fixed frame 3 and the frame frame 5 increases as the distance from the corner 3b of the fixed frame 3 increases. Is possible. Therefore, when the lighting cover 2 is opened and closed, the trajectory of the rotation of the frame 5 becomes constant, so that the lighting cover 2 does not perform an unexpected operation by the operator when the lighting cover 2 is opened and closed. Therefore, the generation and breakage of wrinkles caused by applying a large force to the first light diffusing member 6 and the second light diffusing member 7 can be prevented, which contributes to the realization of uniform surface illumination. Furthermore, the safety of work involving opening and closing of the lighting cover 2 is improved.

  The other end portion 8b of the first connecting rod 8 and the other end portion 9b of the second connecting rod 9 are connected to a surface of the frame frame 5 facing the fixed frame 3 via a connecting member 10. Since the second light diffusing member 7 is provided on the side of the frame 5 opposite to the surface facing the fixed frame 3, the first connecting rod 8 and the second connecting rod 9 and the frame 5 The connecting portion does not interfere with the second light diffusing member 7. For this reason, when providing the connection part with the 1st connection rod 8 and the 2nd connection rod 9 in the frame 5, the process of making a hole in the 2nd light-diffusion member 7, etc. is unnecessary. Therefore, the second light diffusing member is not easily wrinkled and damaged, and uniform surface illumination without unevenness is realized. Further, it is not necessary to make a hole in the first light diffusing member 6 in the opening 5a of the frame frame, and a completely sealed space is formed by the frame frame, the first light diffusing member, and the second light diffusing member. can do.

  As shown in FIGS. 5 and 6, the other end portion 8 b of the first connecting rod 8 and the other end portion 9 b of the second connecting rod 9 are connected to the frame frame 5 via the connecting member 10. The cross-sectional shape of the connection member 10 viewed from a direction parallel to the side of the frame 5 to which the connection member 10 is connected is substantially L-shaped. For this reason, the 1st connecting rod 8 and the 2nd connecting rod 9 are connected to a frame frame more suitably, ensuring connection strength.

  In the present embodiment, the first connecting rod 8 and the second connecting rod 9 are connected to the frame frame 5 and the fixed frame 3 via the connecting member 10 and the connecting member 11, respectively. And it is good also as connecting with the frame frame 5 and the fixed frame 3 directly not via the connection member 11. FIG.

  FIG. 9 is an enlarged view showing the vicinity of the illumination cover fastener 12. FIG. 10 is a cross-sectional view taken along line III-III in FIG. The lighting cover fastener 12 includes a locking hook 12a, a lever member 12b, a hook holding portion 12c, and a locking rod 12d. The locking hook 12a is rotatable about an axis held by the hook holding part 12c, and has a hook part for locking to the locking rod 12d. The locking hook 12a is rotated by operating the lever member 12b. The hook holding portion 12 c is a member that holds a shaft portion for rotating the locking hook 12 a and is attached to the upper surface of the frame frame 5. The locking rod 12 d is a U-shaped member attached to the lower surface of the fixed frame 3. The lighting cover 2 can be held in a closed state by operating the lever member 12b to lock the hook portion of the locking hook 12a to the locking rod 12d. Further, by operating the lever member 12b to remove the hook portion of the locking hook 12a from the locking rod 12d, the frame frame 5 can be rotated and the lighting cover 2 can be opened.

FIG. 1A is a schematic perspective view showing a state in which the illumination cover of the illumination apparatus of the present embodiment is closed. FIG. 1B is a schematic perspective view of the lighting cover opened. It is a schematic bottom view of the illuminating device of this embodiment. It is a schematic sectional drawing in alignment with the II line | wire of FIG. It is a schematic perspective view of an example of the glass fiber sheet used for the 1st light diffusing member and the 2nd light diffusing member. It is a figure which expands and shows the connection part of a fixed frame and a frame. It is sectional drawing along the II-II line of FIG. It is a schematic sectional drawing of the state by which the illumination cover of the illuminating device shown in FIG. 3 was opened. It is a figure which expands and shows the connection part of a fixed frame and a frame frame in the state where the illumination cover was opened. It is a figure which expands and shows the vicinity part of a lighting cover fastener. It is sectional drawing along the III-III line of FIG.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Lighting cover, 3 ... Fixed frame, 4 ... Light source, 5 ... Frame frame, 5a ... Opening, 6 ... 1st light-diffusion member, 7 ... 2nd light-diffusion member, 8 ... 1st 9 ... second connecting rod, 10 ... connecting member, 12 ... lighting cover fastener, 20 ... ceiling, 30 ... glass fiber sheet, 31 ... glass fiber fabric, 32 ... warp, 33 ... weft, 34 ... Resin coating layer.

Claims (1)

A lighting device having a light source and a lighting cover arranged to cover the light source,
The lighting cover includes a frame, a first light diffusing member, and a second light diffusing member,
The frame has an opening for passing light emitted from the light source,
The light source side end of the opening is covered with the first light diffusing member,
The other end of the opening opposite to the light source is covered with the second light diffusing member,
The first light diffusion member comprises a glass fiber sheet having a glass fiber fabric and a resin coating layer covering the glass fiber fabric,
The second light diffusing member comprises a glass fiber sheet having a glass fiber fabric and a resin coating layer covering the glass fiber fabric,
The total light transmittance of the first light diffusing member is 80% or more, and the haze value is 70% or more.
The total light transmittance of the second light diffusing member is 40% or more, and the haze value is 80% or more,
A sealed space is formed by the frame frame, the first light diffusing member, and the second light diffusing member.

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