JP2014049261A - Lighting device - Google Patents

Abstract

The emission efficiency of light emitted from a light source in a predetermined direction is prevented from decreasing.
A lighting module includes a light guide plate having a first end, a second end, and a light exit surface (a first surface or a second surface), a first end, In the illumination member 20 including the LED 4 and the light diffusing particles 2 c that are disposed to face each other, and the second end portion 22, the illumination member 20 can be rotated with respect to the window frame 11 about the second end portion 22. And a hinge portion 10 to be fixed.
[Selection] Figure 1

Description

  The present invention relates to a lighting device including a light guide that guides light emitted from a light source.

  Since LEDs (light-emitting diodes) consume less power and have a long life, lighting devices using LEDs have been developed instead of lighting devices using light bulbs. An example of such a lighting device is disclosed in Patent Document 1. In Patent Document 1, (1) a skylight, (2) light from a light source that is disposed adjacent to a light source and is incident from a side surface, and sunlight that is incident through the skylight are below ( An illumination device having a light guide plate that emits light to the side opposite to the skylight is disclosed. Thereby, a light-guide plate can be functioned as an illumination member and a lighting member.

JP 2012-49050 A (published March 8, 2012)

  However, the light guide plate of Patent Document 1 is fixedly disposed on the arcade, and is not disposed so as to be movable, for example, openable and closable. That is, in Patent Document 1, it is not assumed that the light source is turned on and illuminated in a state where the window made of the light guide plate is opened.

  Therefore, Patent Document 1 does not consider the change in the light emission direction based on the opening and closing that occurs when the light guide plate is installed to open and close. Therefore, when the light guide plate of Patent Document 1 can be opened and closed, depending on the open and closed state, the light emission efficiency downward of the light guide plate may be reduced due to the change in the light emission direction. was there.

  The present invention has been made to solve the above-described problems, and its purpose is to provide light emitted from a light source in a predetermined direction even when the illumination device is movably installed. An object of the present invention is to provide an illuminating device capable of preventing a decrease in emission efficiency.

In order to solve the above-described problem, an illumination device according to the present invention
A first end, a second end that is the end opposite to the first end, and a light exit surface that emits light guided from the first end toward the second end. A light guide having,
A light source disposed opposite the first end and emitting light to the first end;
An illumination member comprising: a traveling direction changing mechanism that is disposed in or near the light guide, changes a traveling direction of light guided through the light guide, and emits the light from the light exit surface;
The second end portion includes a fixing member that fixes the illumination member so as to be rotatable about the second end portion with respect to an attachment target to which the illumination member is attached.

  According to the above configuration, the illumination member includes the light guide, the light source, and the traveling direction changing mechanism. By arranging the traveling direction changing mechanism in or near the light guide, the traveling direction (light propagation direction) of the light emitted from the light source and guided through the light guide can be changed, so that the light is emitted. The light can be efficiently emitted from the entire surface. That is, the emission range of the illumination light of the illumination device can be expanded.

  Here, when the traveling direction of the light incident from the first end is changed by the traveling direction changing mechanism, the traveling direction of the light after the change is the traveling direction of the light before the change (the light traveling toward the traveling direction changing mechanism). Depending on the direction of travel). For this reason, the intensity distribution of the light after the change spreads in the traveling direction of the light before the change, rather than the normal direction of the light emitting surface. Therefore, when the light source is arranged facing the first end, the amount of light emitted from the light exit surface is greater on the second end than on the first end.

  In addition, the lighting member has a predetermined space at a predetermined position before rotation (for example, when the lighting device functions as a window lighting device attached to a window, the position when the window is closed). Illuminated. Therefore, in the first end portion, when the illumination member is fixed to the attachment target so as to be rotatable about the first end portion as an axis, the light emission surface is increased as the illumination member is rotated away from the predetermined position. Since the spread range of the light emitted from the space increases to a space other than the predetermined space, the amount of light emitted to the predetermined space decreases (for example, see FIG. 7).

  On the other hand, in the lighting device according to the present invention, the light source is disposed opposite to the first end (that is, the light source is disposed on the first end side), and the lighting member is disposed at the second end. A fixing member is provided to be fixed to the attachment target so as to be rotatable about the second end as an axis. According to this configuration, it is possible to increase the amount of light emitted toward the second end portion serving as the axis. Therefore, even when the illumination member rotates and moves away from the predetermined position, the light exit surface Since the emission range of the emitted light can be set within a predetermined space (the light traveling direction after change is directed to the predetermined space), it is possible to prevent a decrease in the amount of light emitted to the predetermined space ( For example, see FIG.

  Therefore, according to the illumination device of the present invention, it is possible to prevent a decrease in the emission efficiency of light emitted from the light source in a predetermined direction even when a movable illumination member is provided.

Furthermore, the illumination device according to the present invention is arranged so as to partition an illumination space that is a main object of illumination and a non-illumination space that is a space other than the illumination space,
The fixing member enables the lighting member to be opened and closed between the illumination space and the non-illumination space by fixing the illumination member rotatably at the second end,
The illumination member is preferably arranged so that the light exit surface faces the illumination space when the illumination member is in a closed state.

  According to the above configuration, when the illumination member is in the closed state, the light emission surface is disposed so as to face the illumination space that is the main target of the illumination. Therefore, in the closed state, the light emission surface is emitted from at least the light emission surface. All of the light can be guided to the irradiation space.

  In addition, the lighting member can be opened and closed between the lighting space and the non-lighting space by the fixing member. Therefore, even when the illumination member is in the open state, the traveling direction of the light emitted from the light emitting surface can be directed to the second end portion side serving as an axis, so that the light is guided to the illumination space side. be able to. Therefore, it is possible to prevent a decrease in the emission efficiency toward the illumination space, and it is possible to improve the utilization efficiency of the light emitted from the light source.

Furthermore, the lighting device according to the present invention functions as a window lighting device attached to a building window,
The lighting space is a room in a room provided inside the building,
The non-illuminated space is preferably outside the room.

  According to the said structure, the radiation | emission efficiency to the room | chamber interior of the room which is the illumination space used as the main object of illumination can be improved.

  Furthermore, the illumination device according to the present invention preferably includes an angle holding member that holds the illumination member so that the rotation angle of the illumination member is constant.

  According to the said structure, an illumination member can be fixed to the position (for example, position in the open state) away from the predetermined position (for example, position in the closed state) before the said rotation by the angle holding member. Therefore, it is possible to illuminate a predetermined space while being fixed in such a state.

Furthermore, the lighting device according to the present invention includes a frame body arranged so as to surround the entire end portion of the light guide,
It is preferable that the fixing member is attached to the frame.

  According to the above configuration, the fixing member is attached to the frame, and the fixing member is directly connected to the light guide, thereby improving the fixing strength compared to the case where the lighting member is fixed to the attachment target. Can do. Moreover, attachment (processing) to the attachment object of an illumination member also becomes easy.

  Furthermore, in the illumination device according to the present invention, the light emission angle, which is the range in which the light intensity of the light emitted from the light exit surface of the light guide is maximized, is from the first end to the second end. It is preferable that the angle is greater than 0 degree and not more than 40 degrees toward the normal direction of the light exit surface with reference to the direction in which the light travels.

  According to the said structure, since the light emission angle is larger than 0 degree | times and below 40 degree | times, even in the open state of an illumination member, the leakage of the emitted light to the non-illumination space side can be prevented reliably.

  Furthermore, in the illuminating device according to the present invention, it is preferable that the traveling direction changing mechanism is a light diffusing material that diffuses light emitted from the light source, which is included in the light guide.

  According to the above configuration, since the traveling direction changing mechanism is a light diffusing substance included in the light guide, the light incident from the first end can be diffused inside the light guide. Therefore, the light can be efficiently emitted from the entire light emission surface.

  In addition, since the traveling direction changing mechanism is included in the light guide, the traveling direction changing mechanism does not scatter light incident from one side of the illumination device. Therefore, the visibility from the other side of the lighting device can be improved.

Furthermore, in the illumination device according to the present invention, the light guide has a first surface and a second surface that is a surface opposite to the first surface, and the first surface. And any one of the second surfaces is the light exit surface,
A first cover member disposed facing the first surface and protecting the first surface;
A second cover member disposed opposite to the second surface and protecting the second surface,
It is preferable that the first cover member and the second cover member have translucency and have different light reflectivities.

  According to the above configuration, since the first cover member and the second cover member are provided on the first surface and the second surface of the light guide, respectively, the first surface and the second surface of the light guide are provided. Can be prevented from being exposed to the outside. Therefore, it is possible to prevent the light guide from being damaged due to an external impact and to prevent the light guide from being damaged, and to prevent the emission efficiency of light emitted from the light guide from being lowered due to the intrusion of dust from the outside. it can. That is, the impact resistance and convenience of the light guide can be improved.

  Moreover, since the 1st cover member and the 2nd cover member have translucency, the light radiate | emitted from the light guide can be irradiated to the exterior of an illuminating device.

  Further, the first cover member and the second cover member have different light reflectivities. The light emitted from the light source and emitted from the first surface and the second surface of the light guide is transmitted from the first cover member and the second cover member with a high light reflectivity. The amount of reflected light can be made larger than the amount of transmitted light. On the other hand, in the cover member having a low light reflectance, it is possible to increase the amount of light transmitted more than the amount of light reflected. That is, the amount of light emitted from the cover member having a low light reflectance to the outside of the lighting device can be increased, and the amount of light emitted from the cover member having a high light reflectance to the outside of the lighting device can be reduced. . That is, the illuminating device can improve the emission efficiency in the direction (predetermined space) in which the cover member with low light reflectance is provided.

  Therefore, by arranging the first and second cover members so that the reflectance of the cover member on the light emitting surface side is lower than the reflectance of the other cover member, the light guide has a simple structure. The impact resistance and convenience can be improved, and the emission efficiency of light emitted from the light source to a predetermined space can be improved.

Furthermore, the illumination device according to the present invention is arranged so as to partition an illumination space that is a main object of illumination and a non-illumination space that is a space other than the illumination space, and the light emitting surface is the first light source. Of the
The surface of the first cover member opposite to the surface facing the light guide member is in contact with the non-illumination space,
The surface of the second cover member opposite to the surface facing the light guide member is in contact with the illumination space,
The light reflectance of the first cover member is preferably higher than the light reflectance of the second cover member.

  According to the above configuration, the amount of light emitted from the light guide toward the first cover member and reflected by the first cover member is emitted toward the second cover member, and the second cover member The amount of light reflected can be increased. Therefore, it is possible to increase the amount of light emitted to the second cover member side (that is, the second surface side that functions as the light emission surface).

  Further, the first cover member is disposed on the non-illumination space side, and the second cover member is disposed on the illumination space side. For this reason, the amount of light emitted toward the illumination space can be increased.

  Therefore, since the emission efficiency to the illumination space that is the main object of illumination can be improved, the utilization efficiency of the light emitted from the light source can be improved.

Furthermore, in the lighting device according to the present invention, the light guide and the first cover member are provided apart from each other,
It is preferable that the light guide and the second cover member are provided apart from each other.

  According to the above configuration, since the light guide and the first and second cover members are provided separately from each other, the close contact of the contact surfaces that occurs when these members are arranged to contact each other. Interference fringes or light scattering due to degree non-uniformity can be prevented. That is, the uniformity of light can be prevented from being impaired.

  The lighting device according to the present invention guides light from the first end, the second end opposite to the first end, and the first end toward the second end. A light guide having a light emitting surface for emitting light, and disposed to face the first end, a light source for emitting light to the first end, and disposed in or near the light guide, The lighting member includes a lighting direction change mechanism that changes a traveling direction of light guided through the light guide and emits the light from the light emitting surface, and the lighting member is attached to the lighting member at the second end. And a fixing member that is fixed to be pivotable about the second end portion as an axis.

  Therefore, the illumination device of the present invention has an effect that it is possible to prevent a decrease in the emission efficiency of light emitted from the light source in a predetermined direction even when the illumination device includes a movable illumination member. .

It is a figure for demonstrating the function of the illumination module which concerns on one Embodiment of this invention, (a) is schematic which shows the whole structure of an illumination module, (b) is schematic which shows the side cross section of an illumination module (C) is a schematic diagram showing a side cross-section of the illumination module when the illumination member is open. It is the schematic which shows how the light ray progresses at the time of LED non-lighting and lighting at the cross section of the light guide plate of the illumination module, (a) shows the non-lighting state of the LED, (b) shows the lighting state of the LED. FIG. It is the schematic which shows the example in which the said illumination module is installed as a skylight, (a) is a figure which shows the state which the said illumination module has light-extinguished, and (b) is the state in which the said illumination module is lighted FIG. It is a figure which shows the example of installation of the illumination module as the said skylight, (a) is a figure which shows the state which the illumination member with which an illumination module is equipped is closed, (b) shows the state which the said illumination member has opened. FIG. It is the schematic for demonstrating how the light ray advances at the time of lighting of LED in the light-guide plate cross section of the said illumination module, (a) is a figure which shows an example of the way of the light ray at the time of LED lighting, ) Is a diagram showing an example of measurement data of the light distribution characteristics of the light beam. It is a figure which shows an example of the advancing direction of the light ray radiate | emitted from LED when the said illumination member is in the open state. It is a comparative example of the illumination module as the said skylight, Comprising: It is a figure which shows an example of the direction which the light ray radiate | emitted from LED advances when the illumination member with which the said illumination module is provided is open. It is a figure for demonstrating the function of the illumination module which concerns on another embodiment of this invention, (a) is the schematic which shows the whole structure of an illumination module, (b) is the outline which shows the side surface cross section of an illumination module. FIG. It is a figure for demonstrating the function of the protective glass with which the said illumination module is equipped, (a) is the light-guide plate in the state which LED is lit in the case where the protective glass is provided in the both sides of the light-guide plate, and It is the schematic which shows the side surface cross section of protective glass, (b) of the light guide plate and a pair of protective glass in the state in which LED is lit in the case where protective glass is provided on one side of the light guide plate It is the schematic which shows a side surface cross section, (c) is the schematic which shows the side surface cross section of the light-guide plate in the state in which LED is lighting when the glass for protection is not provided. It is a figure for demonstrating the function of the modification of the said illumination module, (a) is schematic which shows the whole structure of an illumination module, (b) is the schematic which shows the side surface cross section of an illumination module.

Embodiment 1
An embodiment of the present invention will be described below with reference to FIGS. A lighting device according to an embodiment of the present invention includes various doors such as a house entrance door, doors for shops and various facilities, residential building materials (partitions, etc.) other than doors, wall surfaces and floor surfaces of buildings. , Furniture such as cupboards and kitchen storage, windows (skylights), gateposts, nameplates, and public exteriors (fences, signs, bulletin boards, guide lights, handrails). In the following, an illumination module (illumination device) 1 attached to a skylight will be described as an embodiment of the illumination device of the present invention.

  Note that the structure into which the lighting device is incorporated may be a structure that is required to guide light from the outside to the inside of the structure or in the opposite direction. Further, the structure may be formed by combining a plurality of illumination modules 1. Moreover, the said illuminating device may be implement | achieved as a member for windows fitted in the window frame which has a rail, and movable along the said rail.

<Configuration of lighting module 1>
An illumination module 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. First, the schematic configuration of the illumination module 1 will be described with reference to FIG. 1A and 1B are diagrams for explaining the function of the illumination module 1 according to the present embodiment, wherein FIG. 1A is a schematic diagram illustrating the overall configuration of the illumination module 1, and FIG. 1B is a side cross-sectional view of the illumination module 1. (C) is the schematic which shows the side surface cross section of the illumination module 1 when the illumination module 1 is in the open state. The area A in FIG. 1B is a more detailed illustration of the area A in FIG.

  As shown in FIG. 1A, the illumination module 1 (illumination device, window illumination device) includes a frame 6, a hinge 10 (fixed member), a window frame 11 (attachment target), and an illumination member 20. I have. In the present embodiment, the frame 6 will be described as a part of the configuration of the lighting member 20. Further, as shown in FIG. 1C, the illumination module 1 includes an angle holding member 12.

  Further, as shown in FIG. 1B, the illumination member 20 includes a light guide plate 2 (light guide, light guide member), light diffusion particles 2c as a traveling direction changing mechanism, an LED 4 (light source), and a holding member 5. A frame 6 (frame body), a buffer member 7, and a base portion 8. In this illumination module 1, the light (light beam) emitted from the LED 4 is guided by the light guide plate 2, and both surfaces of the light guide plate 2 (the first surface 2a and the second surface 2b shown in FIG. 1B). Are emitted to the outside of the illumination module 1.

  In the present embodiment, the illumination module 1 has a rectangular shape, and the size thereof is 167 mm in the vertical direction (height direction, x direction) and 230 mm in the horizontal direction (lateral direction, y direction). The thickness (length in the z direction) is 32 mm, but is not limited thereto. That is, the size and shape of the illumination module 1 may be set according to the size of the skylight to which the illumination module 1 is attached, the installation location thereof, and the like. For example, the shape of the illumination module 1 may be circular or elliptical. In addition, the magnitude | size and shape of each member with which the illumination module 1 is provided are not limited to the magnitude | size and shape shown below.

<Hinge part 10>
The hinge portion 10 connects the window frame 11 and the frame 6 so that the illumination member 20 can move relative to the window frame 11. Thereby, the illumination module 1 having the illumination member 20 that can be opened and closed in the direction of the arrow shown in FIG. 1C, that is, the illumination module 1 that has a function as an openable and closable window can be realized.

  Although the hinge part 10 has a general hinge structure, the present invention is not limited to this, and it is sufficient that the window frame 11 and the frame 6 can be connected so that the illumination member 20 can be opened and closed.

  As shown in FIG. 1B, the hinge portion 10 is an end opposite to the second end portion 22 of the light guide plate 2 (that is, the first end portion 21 of the light guide plate 2 facing the LED 4). Part), the illuminating member 20 is fixed to the window frame 11 to which the illuminating member 20 is attached so as to be rotatable about the second end 22. Thereby, even if the illumination member 20 can be moved, it is possible to prevent the emission efficiency of the light emitted from the LED 4 from being reduced to a predetermined space (the illumination space that is the main object of illumination).

  In the present embodiment, “the lighting member 20 rotates about the second end 22” means that the lighting member is in a plane including the window frame 11 (a predetermined position before the rotation (in the closed state)). The first surface 2a and the second surface 2b when there is 20 as a reference plane, and the illumination member with the second end 22 as an axis so as to have a predetermined angle with respect to the reference plane This means that 20 moves.

  Moreover, the illumination module 1 which concerns on this embodiment is arrange | positioned so that an illumination space and the non-illumination space which is spaces other than the said illumination space may be partitioned off. For example, when the indoor or indoor side of a building is an illumination space, and the outdoor or outdoor side is a non-illumination space, the illumination module 1 is arranged so as to partition the indoor or outdoor. In this case, the hinge part 10 enables the opening / closing operation of the illumination member 20 between the illumination space and the non-illumination space by fixing the illumination member 20 rotatably at the second end portion 22 of the light guide plate 2. ing.

  In addition, the positional relationship between the position where the hinge portion 10 is provided and the LED 4 included in the illumination member 20 will be described in the section <About the light emission direction>.

<Window frame 11>
The window frame 11 defines the outer shape of the lighting module 1 and improves the appearance of the lighting module 1. Further, the window frame 11 functions as a fixed portion (chassis) that fixes the position of the illumination member 20 that functions as a movable portion that rotates around the second end portion 22.

  The material of the window frame 11 is preferably metal from the viewpoint of nonflammability, and aluminum is particularly preferable from the viewpoint of lightness and heat dissipation. On the other hand, the material of the window frame 11 may be resin instead of metal. In this case, the lighting module 1 with a higher heat insulation effect can be provided.

<Angle holding member 12>
The angle holding member 12 functions as a connecting portion that connects (connects) the frame 6 and the window frame 11 at a portion different from the hinge portion 10. The angle holding member 12 holds the lighting member 20 so that the rotation angle of the lighting member 20 is constant. Thereby, as shown in FIG. 1C, the illumination member 20 is not only rotatable by the hinge portion 10, but also the illumination member 20 in the open state (open state) is connected to the first end portion of the light guide plate 2. It can hold | maintain at arbitrary angles with respect to the straight line (one-dot chain line in a figure) which connects the both ends of the window frame 11 corresponding to 21 and the 2nd end part 22. FIG. That is, the illumination member 20 in the open state can be fixed at a predetermined position (a position away from the reference plane by a predetermined angle). Therefore, it is possible to illuminate the illumination space with the light emitted from the LED 4 in the opened state of the illumination member 20 and to exchange air in the two spaces partitioned by the illumination module 1. .

  The angle holding member 12 only needs to have a structure capable of fixing (supporting) the illumination member 20 in the open state at the predetermined position, and includes, for example, two plate members and a hinge. In this case, the ends of the two plates are connected by hinges, and the ends of the two plates opposite to the ends connected by the hinges are connected to the frame 6 or the window frame 11. The shape is not limited to this, and any shape may be used as long as it is a mechanism that can fix the illumination member 20 in the open state at the predetermined position.

  Further, the material of the angle holding member 12 is made of, for example, a metal such as aluminum or a resin, like the window frame 11.

<Lighting member 20>
Next, the configuration of the illumination member 20 will be described. The illumination member 20 illuminates the outside of the illumination member 20 by emitting the light emitted from the LED 4 to the outside. Moreover, the illumination member 20 takes in external light, when the illumination module 1 functions as a window. That is, the illumination member 20 is a member having both an external illumination function and a daylighting function. The details will be described below.

(Light guide plate 2)
As shown in FIG. 1B, the light guide plate 2 includes a first end 21, a second end 22 (second side) that is an end opposite to the first end 21, and a first end. It has the 1st surface 2a which radiate | emits the light guided toward the 2nd end part 22 from the edge part 21 to the exterior, and the 2nd surface 2b which is a surface on the opposite side to the 1st surface 2a. Is.

  The LED 4 is disposed at a position facing the first end portion 21 (end surface (side surface) of the first side) of the light guide plate 2, and light emitted from the LED 4 from the first end portion 21 is inside the light guide plate 2. Incident light (side incident light). The light guide plate 2 guides the light emitted from the LEDs 4 in the inside thereof and emits the light from at least the first surface 2a or the second surface 2b.

  Here, the 1st surface 2a or the 2nd surface 2b functions as a light-projection surface which radiate | emits the light from LED4. The “light exit surface” mainly refers to a surface on the side that contributes to illumination outside the illumination module 1 when considering the function of the illumination module 1 as an illumination device. As described above, the illumination module 1 is arranged so as to partition the illumination space and the non-illumination space. Therefore, the “light emitting surface” in the present embodiment mainly refers to the first surface 2a or the second surface 2b of the light guide plate 2 facing the illumination space. That is, in reality, light emitted from the surface of the light guide plate 2 that does not need to function as a light emitting surface (the surface opposite to the light emitting surface) cannot be completely prevented. The emitted light is emitted from both the first surface 2a and the second surface 2b, but in this embodiment, the surface of the light guide plate 2 on the space side that is supposed to be illuminated is “light-emitted. It will be referred to as “surface”. Further, a light beam (emitted light beam) emitted from the first surface 2a or the second surface 2b serving as a light emitting surface becomes an effective light beam that illuminates an illumination space (for example, indoors or indoors). In the following description, it is assumed that the second surface 2b is a light exit surface.

  The illumination member 20 is disposed so that the second surface 2b of the light guide plate 2 serving as a light emission surface faces the illumination space when the illumination member 20 is closed. Thereby, at the time of a closed state, all the light radiate | emitted from the 2nd surface 2b of the light-guide plate 2 can be guide | induced to the said irradiation space.

  Further, as described above, the illumination member 20 is connected to the second end portion 22 of the light guide plate 2 (that is, the end opposite to the first end portion 21 of the light guide plate 2 facing the LED 4) by the hinge portion 10. Part) is fixed to the window frame 11 so as to be rotatable about the second end 22 as an axis. That is, the illumination member 20 can be rotated by the hinge portion 10 attached to one end (side) of the light guide plate 2, and the light emitted from the LED 4 is on the side opposite to the one end. The light enters the light guide plate 2 from the end.

  The light guide plate 2 has translucency. This “translucency” means that light is transmitted (transmitted), and does not necessarily mean that the light guide plate 2 is a transparent body. That is, the light guide plate 2 may appear milky white, for example, as long as it transmits light. In the present embodiment, since the light guide plate 2 has a transmittance of about 90% with respect to visible light when the LED 4 is not lit, the illumination module 1 with high daylighting can be realized.

  Examples of the material of the light guide plate 2 include glass materials including organic glass made of methacrylic resin (PMMA) or acrylic resin. In addition, it is possible to use a synthetic resin having a high transmittance at the time of non-lighting such as MS resin, polycarbonate (PC) resin, polyester resin, vinyl chloride resin and the like.

  In the present embodiment, the size of the light guide plate 2 is shorter than the horizontal length of the illumination module 1 by the amount of the window frame 11 with respect to the horizontal length. Moreover, about the length of the vertical direction, in addition to the part of the window frame 11, it is shorter than the length of the vertical direction of the illumination module 1 by the part for the arrangement | positioning location of LED4 in the vicinity of the 1st end part 21. . The thickness of the light guide plate 2 is 1.5 mm.

  Note that the shape of the light guide plate 2 matches the shape of the illumination module 1 as long as the LED 4 is disposed on the first end 21 side and the hinge portion 10 is disposed on the second end 22 on the opposite side. Can be set freely. Moreover, the 1st surface 2a and the 2nd surface 2b can also be set freely, For example, polygons (for example, pentagon) other than a rectangle, a circle | round | yen, etc. may be sufficient. In addition, the light guide plate 2 is not necessarily a flat plate (that is, the thickness may not be uniform in the plane) and may be curved.

(Travel direction change mechanism)
Further, the illumination member 20 includes a traveling direction changing mechanism that changes the traveling direction of the light guided through the light guide plate 2 and emits the light from the second surface 2b that is a light emitting surface in or near the light guide plate 2. ing. Examples of the traveling direction changing mechanism of the present embodiment include a “light diffusion material method” and a “light extraction structure method” described below.

(Light diffusion material method)
In the present embodiment, for example, as shown in FIG. 2B, the light diffusing particles 2c (light diffusing substance, light diffusing agent) that diffuse the light emitted from the LED 4 are provided inside the light guide plate 2 as a traveling direction changing mechanism. Included. That is, the traveling direction changing mechanism is realized by the light diffusing material method. In this case, since the light traveling direction can be changed by diffusing the light incident from the first end 21 inside the light guide plate 2, the light can be efficiently emitted from the entire second surface 2b. Can do.

  In addition, since the light diffusing particles 2 c are included in the light guide plate 2, the light diffusing particles 2 c do not scatter light incident from one side (non-illumination space side) of the illumination module 1. Therefore, the visibility from the other side of the illumination module 1 (visibility from the illumination space side to the non-illumination space side) can be improved. For example, when the lighting module 1 is used for a skylight or the like, the outdoor scenery can be clearly seen.

  Here, FIG. 2 shows how light travels when the LED 4 is not lit and when the LED 4 is not lit in the cross section of the light guide plate 2 including the light diffusing particles 2c. In FIG. 2, only a part of the first surface 2 a and the second surface 2 b of the light guide plate 2 is shown for simplification.

  When the LED 4 is not lit, as shown in FIG. 2A, when external light such as sunlight is irradiated on the first surface 2a, the external light passes through the inside of the light guide plate 2 and is second. The light exits from the surface 2b. On the other hand, when the LED 4 is turned on, as shown in FIG. 2B, the light guide plate 2 guides the light emitted from the LED 4 and diffuses it by the light diffusion particles 2c included in the light guide plate 2. The light can be emitted from the first surface 2a and the second surface 2b.

  Here, as described above, in the light guide plate 2 of the present embodiment, the second surface 2b facing the illumination space mainly functions as a light emitting surface. In general, when the light diffusing particles 2c are evenly distributed inside the light guide plate 2, as shown in FIG. 2 (b), light is uniformly emitted from both the first surface 2a and the second surface 2b. Is emitted. Therefore, in the present embodiment, for example, the distribution of the light diffusing particles 2c is adjusted so as to increase the light emission efficiency from the second surface 2b. A method for increasing the emission efficiency to the light emission surface by providing the protective glass (protective cover material) will be described in the second embodiment.

  Thus, while the illumination module 1 functions as a daylighting window when the LED 4 is not lit, it can illuminate the periphery of the illumination module 1 (particularly, the illumination space on the second surface 2b side) when the LED 4 is lit. it can. In addition, since the light diffusing particles 2c are included in the light guide plate 2, the transparency of the light guide plate 2 in the unlit state is improved. Therefore, when the non-illuminated space (for example, outdoors) is bright, it is more Can be incident on the illumination space (for example, indoor) side.

  In the case where the light diffusing particles 2 c are included in the light guide plate 2, for example, Delaglass AL997 manufactured by Asahi Kasei can be used as the light guide plate 2.

(Light extraction structure method)
Moreover, the light extraction structure system which scatters the light from LED4 and changes the advancing direction of the said light instead of said light-diffusion substance system may be employ | adopted. In this light extraction structure method, the traveling direction changing mechanism is arranged on the surface of the light guide plate 2 (in the vicinity of the light guide plate 2). In this method, for example, a light-diffusing pattern (light scatterer) may be printed, or a substantially hemispherical (microlens) structure having a refractive index different from that of the light guide plate 2 is provided by an ink jet technique. Alternatively, a rough surface may be formed by sand blasting or the like (unevenness processing may be performed on the surface of the light guide plate 2). Further, the surface of the light guide plate 2 may be finely processed such as a prism.

  Even in this case, since the light incident from the first end 21 can be scattered in the vicinity of the second surface 2b of the light guide plate 2, the efficiency can be improved from the entire second surface 2b serving as the light emitting surface. It can emit well.

  However, in the case of the light extraction structure method, not only the light emitted from the LED 4 but also light incident from the outside of the illumination module 1 is scattered, so the visibility from the illumination space side to the non-illumination space side is reduced. There is a possibility that. Therefore, when the visibility is taken into consideration, it is preferable to employ the above-described light diffusing material method as the traveling direction changing mechanism.

(LED4)
The LED 4 functions as a light source for the illumination module 1. As shown in FIG. 1B, the LED 4 is provided in the vicinity of the first end 21 of the light guide plate 2 so that the direction of the light emitting surface (light emission direction) faces the light guide plate 2 side. Has been placed. That is, LED4 is arrange | positioned so as to oppose the 1st end part 21 on the opposite side to the 2nd end part 22 to which the hinge part 10 is attached, and other end parts including the 2nd end part 22 are included. Is not arranged. The superiority of this arrangement will be described in the section <About the light emission direction>.

  In the present embodiment, the light emitting surface of the LED 4 is a top surface, the LED 4 is provided on the substrate 9, and the surface of the substrate 9 opposite to the surface on which the LED 4 is placed is fixed to the base portion 8. ing. LED4, the board | substrate 9, and the base part 8 are being fixed with the adhesive agent, the double-sided tape, etc., for example. In addition, as long as LED4 is arrange | positioned so that the direction of a light emission surface may face the 1st edge part 21 side of the light-guide plate 2, a side emission type light emitting diode may be sufficient. In this case, the substrate 9 on which the LEDs 4 are placed is fixed to the holding member 5 or the light guide plate 2 itself.

  The LED 4 is supplied with electric power via a substrate 9 by a wiring or a connector (not shown).

  Regarding the substrate 9 on which the LED 4 is placed, the surface on which the LED 4 is mounted (the surface on which the LED 4 is placed) efficiently reflects the light emitted from the LED 4 and couples it to the light guide plate 2. In order to improve the optical coupling efficiency, white is preferable. In this case, a white resist is generally applied. The mounting surface of the LED 4 does not necessarily have to be white as long as the light emitted from the LED 4 can be efficiently reflected, and may be another light color.

  Further, in order to improve the optical coupling efficiency, a reflective sheet or the like is attached to a peripheral portion of the light emitting surface of the LED 4, that is, a part of the holding member 5 located in the periphery of the LED 4. More preferred. The reflective sheet is made of PET (polyethylene terephthalate), PC (polycarbonate), or the like, and preferably has a white appearance and a high light reflectivity. However, the reflective sheet may have a mirror surface on which a metal is deposited. . Furthermore, a member having a high light reflectance may be used for the holding member 5.

  Further, the light source of the illumination module 1 is not limited to the LED 4 and may be a light source such as CCFL, for example. However, in view of the low power consumption and long life, a light emitting diode is preferable.

(Holding member 5)
The holding member 5 holds the light guide plate 2 on the frame 6 and the base portion 8 constituting the outer frame of the lighting member 20 by fixing the light guide plate 2. The holding member 5 and the light guide plate 2 are fixed with, for example, an adhesive or a double-sided tape. The light guide plate 2 may be fixed by providing a screw hole at a predetermined position of the light guide plate 2 and tightening the screw.

  As shown in FIG. 1B, the first end 21 and the second end 22 of the light guide plate 2 are fixed by the holding member 5. By fixing the first end portion 21 and the second end portion 22, it is possible to prevent at least the light from traveling from the second surface 2 b functioning as a light emitting surface from being hindered. That is, the light guide plate 2 can be fixed without reducing the emission efficiency of light emitted from at least the second surface 2b. In addition, in FIG.1 (b), although the 1st edge part 21 and the 2nd edge part 22 of the light-guide plate 2 are being fixed, you may fix not only this but another edge part. Further, if the emission efficiency is not taken into consideration, the light guide plate 2 may not be fixed at the end.

  The material of the holding member 5 is preferably a metal from the viewpoint of nonflammability. Among these, aluminum is more preferable from the viewpoint of lightness and heat dissipation. If these points are not taken into consideration, the material is not particularly limited as long as it is a material capable of holding the light guide plate 2 such as an acrylic resin.

(Frame 6)
The frame 6 is disposed so as to surround the entire end portion of the light guide plate 2. That is, the frame 6 functions as a frame (chassis) of the illumination member 20 that functions as a movable part. The frame 6 has a sealing structure for the lighting module 1 and improves the appearance of the lighting module 1 as with the window frame 11. By making the illumination module 1 have a sealed structure, the heat insulation effect of a specific space such as a room (indoor) can be enhanced.

  The material of the frame 6 is preferably a metal as in the case of the holding member 5 from the viewpoint of nonflammability, and aluminum is particularly preferable from the viewpoint of lightness and heat dissipation. On the other hand, the material of the frame 6 may be resin instead of metal. In this case, the lighting module 1 with a higher heat insulation effect can be provided.

  Further, as shown in FIG. 1, since the hinge portion 10 is attached to the frame 6, the hinge portion 10 is directly connected to the second end portion 22 of the light guide plate 2, whereby the lighting member 20 is connected to the window frame 11. The fixing strength can be improved as compared with the case of fixing to. In addition, the lighting member 20 can be easily attached to the window frame 11. If this point is not taken into account, the hinge portion 10 may be directly connected to the second end portion 22 of the light guide plate 2 and the second end portion 22 may be fixed to the window frame 11.

(Buffer member 7)
Further, it is preferable that a buffer member 7 such as boron is interposed between the light guide plate 2 and the holding member 5. Thereby, sufficient force for the holding member 5 to hold the light guide plate 2 can be applied to the member without damaging the light guide plate 2. That is, the light guide plate 2 can be reliably fixed by the holding member 5.

(Base part 8)
The base portion 8 is a member on which the holding member 5 and the substrate 9 are installed and fixed. That is, the light guide plate 2 is fixed to the base portion 8 via the holding member 5, and the LED 4 is fixed to the base portion 8 via the substrate 9.

  The material of the base portion 8 is also preferably a metal, particularly aluminum, like the frame 6.

  The base portion 8 may be a part of the frame 6 instead of being separated from the frame 6.

<Example: skylight>
Next, based on FIG. 3 and FIG. 4, the specific Example when the illumination module 1 mentioned above is provided in structures, such as a building, is demonstrated below. Below, the case where the illumination module 1 is mainly used as a skylight (illumination module 70) is demonstrated.

  The general skylight size is 600 mm in the vertical direction (height direction, x direction) and about 600 mm in the horizontal direction (lateral direction, y direction). The size is set according to the size of the skylight. Needless to say, the size of the skylight (illumination module 70) is not limited to the above size.

  FIG. 3 is a schematic view showing an illumination module 70 (illumination device, window illumination device) installed as a skylight. FIG. 3A shows a state in which the illumination module 70 is turned off, and FIG. 3B shows an illumination module 70. Indicates that is lit.

  As shown in FIGS. 3A and 3B, the illumination module 70 is disposed on a ceiling 71 (a roof of a building, a roof portion, an attachment target), and the first surface 2 a of the light guide plate 2 is Located on the outdoor side, the second surface 2b is located on the indoor side. That is, the illumination module 70 functions as a window illumination device (skylight illumination device) attached to a building window.

  Since the light guide plate 2 has translucency, the illumination module 70 functions as a skylight that performs daylighting when turned off. Therefore, sunlight can be efficiently taken indoors during the daytime. In addition, it is possible to visually recognize the outdoor scenery from day to night (in particular, at night, the night sky can be observed). On the other hand, at the time of lighting, the light guide plate 2 guides the light emitted from the LED 4 and emits it as an effective light beam from the second surface 2b which is a light emitting surface, so that it functions as indoor lighting. Therefore, it is possible to illuminate the interior even when there is no outside light. That is, the illumination module 70 can efficiently illuminate the interior from the upper side (the roof side) while fulfilling the function as a skylight.

  FIG. 4 is a diagram illustrating an installation example of the illumination module 70. As shown in FIG. 4A, when the illumination member 20 is closed, the daylighting function and the illumination function of the illumination module 70 can be effectively operated as shown in FIG. In addition, as shown in FIG. 4B, the illumination module 70 fixes the second end 22 of the light guide plate 2 by the hinge 10 and rotates the illumination member 20 around the second end 22 as an axis. The lighting member 20 can be in an open state (open state).

  As described above, the lighting module 70 includes the lighting member 20 that is fixed to the ceiling 71 of the house by the hinge portion 10 and that can be opened and closed. Since the illumination module 70 is provided on the ceiling, the opening of the illumination member 20 makes it easy to generate wind due to the pressure difference due to the height difference from the floor. Therefore, an air flow can be easily created indoors (indoors), and air can be smoothly exchanged between indoors and outdoors (indoors and outdoors).

  The lighting module 1 is not only used as a residential skylight shown in FIG. 3 and FIG. 4 but also requires daylighting and nighttime lighting effects such as skylights of general commercial facilities and skylights of public facilities. Can be used for the site.

  In addition, by installing or attaching a see-through solar cell on the outdoor side with respect to the lighting module 70, it is possible to perform daylighting and power generation during the daytime, and can be used as illumination using the generated power during the daytime. It is possible to contribute to low power consumption by collecting the lost light leaking to the outdoor side with a solar cell.

  In addition, by pasting the lighting module 70 on all or part of mirrors installed in, for example, a washstand and a bathroom, the function as a normal mirror is not hindered because it is transparent when turned off. When the light is turned on, the pasting portion functions as surface illumination, so that it is possible to provide a function as illumination capable of irradiating light from the closest position to a portion that is desired to be viewed with a mirror.

<About the light emission direction>
Next, the emission direction of the light emitted from the light guide plate 2 will be described with reference to FIGS. First, using FIG. 5, how the light beam travels when the LED 4 is turned on in the cross section of the light guide plate 2 will be described. FIG. 5 is a schematic diagram for explaining how the light beam travels. FIG. 5A is a diagram illustrating an example of how the light beam travels when the LED 4 is lit, and FIG. 5B is a light distribution characteristic of the light beam. It is a figure which shows an example of this measurement data.

  As shown in FIG. 5A, when the light guide plate 2 in which the traveling direction changing mechanism is disposed in or near the traveling direction changing mechanism is used for the illumination module 1, the light (light flux) emitted from the LED 4 is the first end. The light is incident on the light guide plate 2 from the portion 21 and is repeatedly totally reflected at the light guide plate 2 to guide the inside thereof. When the light is guided, the light is emitted from the light guide plate 2 by changing the path to an angle that does not satisfy the total reflection condition by the traveling direction changing mechanism.

  At this time, as shown in FIG. 5A, the normal direction of the second surface 2b of the light guide plate 2 is 0 °, and the direction from the first end 21 toward the second end 22 (emitted from the LED 4). When the incident light is incident on the first end 21) at 90 °, measurement data showing an example of the light distribution characteristic of the light emitted from the light guide plate 2 is obtained as shown in FIG. 5B. . As shown in the figure, the direction emitted from the LED 4 is inclined in the direction in which the light emitted from the LED 4 enters from the normal direction of the second surface 2b, that is, 60 degrees or more from the normal direction. The light is emitted in a tilted direction.

  That is, the measurement data shown in the figure is the traveling direction of the light after being diffused or scattered by the traveling direction changing mechanism (the traveling direction of the light after being changed by the mechanism) is the progress of the light before the diffusion or scattering. It is shown that it depends on the direction (the traveling direction of light entering from the first end 21 and traveling to the traveling direction changing mechanism, and the traveling direction of light before the change by the mechanism). Therefore, the intensity distribution of the light after diffusion or scattering spreads in the traveling direction of the light before diffusion or scattering rather than the normal direction of the second surface 2b. Therefore, when the LED 4 is arranged to face the first end 21, the amount of light emitted from the second surface 2 b is more on the second end 22 side than on the first end 21 side. Become more.

  The light distribution characteristic of the light emitted from the light guide plate 2, that is, the dependency of the traveling direction of the light after diffusion or scattering on the traveling direction of the light before diffusion or scattering includes the rotatable illumination member 20. In the illumination module 1, when it is going to prevent the fall of the emission efficiency to the illumination space of the light radiate | emitted from the 2nd surface 2b, it becomes one of the problems which should be considered. That is, the arrangement relationship between the end of the light guide plate 2 that is the axis of the rotation of the illumination member 20 and the end of the light guide plate 2 facing the LED 4 is determined so as to prevent a decrease in the emission efficiency. Therefore, it is necessary to fully consider the above dependency.

  The arrangement relationship will be described with reference to FIGS. 6 and 7. FIG. 6 is a diagram illustrating an example of the traveling direction of the light beam emitted from the LED 4 when the illumination member 20 of the illumination module 70 of the present embodiment is open. On the other hand, FIG. 7 is a diagram illustrating an example of the traveling direction of the light beam emitted from the LED 4 when the illumination member 120 included in the illumination module 170 which is a comparative example of the illumination module 70 is open. 6 and 7, the case where the illumination module 1 functions as a skylight will be described as an example, but naturally the same applies to the case where the illumination module 1 functions as the other windows described above.

  In FIG. 7, the illumination member 120 of the illumination module 170 is also in a position when the illumination member 20 is in a closed state (predetermined position before rotation), as in the illumination module 70, as shown in FIG. 3B. Lighting the lighting space.

  However, in the illumination module 170, at the first end portion 21 facing the LED 4, the hinge portion 10 fixes the illumination member 20 so as to be rotatable with respect to the ceiling 71 about the first end portion 21 as an axis. Therefore, when the illuminating member 20 is rotated to be in the open state, the spread range of the light emitted from the second surface 2b to the outdoor side is increased. That is, as shown in FIG. 7, in the open state of the lighting member 20, the amount of light emitted to the outdoor side increases due to the above dependency, and the amount of light emitted indoors decreases.

  This means that in the open state of the illumination member 120, most of the emitted light from the illumination module 170 illuminates the outdoor side, not indoors. In other words, in the illumination module 170, in the open state, the interior is not brightened even when the LED 4 is turned on, and the utilization efficiency (illumination efficiency) of the light emitted from the LED 4 to the illumination space becomes very low.

  On the other hand, in the illumination module 70 of the present embodiment, the hinge member 10 is placed on the ceiling 71 (window frame 11) at the second end 22 instead of the first end 21 where the LEDs 4 are opposed. On the other hand, the second end portion 22 is fixed so as to be rotatable. That is, LED4 is arrange | positioned at the 1st end part 21 side where the hinge part 10 does not exist. According to this configuration, as shown in FIG. 6, the amount of light emitted toward the second end 22 serving as the shaft can be increased along with the above dependency, so that the illumination member 20 is rotated and opened. Even in this case, the emission range of the light emitted from the second surface 2b can be within the illumination space. Therefore, it is possible to prevent leakage of emitted light from the second surface 2b like the illumination module 170 shown in FIG. 7 to the non-illuminated space, that is, to prevent a decrease in the amount of emitted light to the illuminated space.

  Thus, according to the illumination modules 1 and 70 of the present embodiment, even when the rotatable (movable) illumination member 20 is provided, the emission efficiency of the light emitted from the LED 4 to the illumination space Can be prevented. That is, since the illumination space side can be efficiently illuminated even when the illumination member 20 is in the open state, the illumination modules 1 and 70 excellent in illumination efficiency (use efficiency of light emitted from the LED 4) are provided. be able to.

  In particular, when the lighting module 1 functions as a window lighting device such as a skylight, the second surface 2b faces an illumination space that is a room (indoor) of a room provided inside the building, and the room 2 It arrange | positions so that the 1st surface 2a may oppose the non-lighting space which is the outdoors (outdoors). Therefore, the emission efficiency to the room (indoor) of the room that is the illumination space can be improved.

  Further, as shown in FIG. 5B, the illumination module 1 has a light guide plate 2 that emits light from the LED 4 from the second surface 2b in a direction inclined by a predetermined angle from the normal direction. It can be said that it is. That is, in the illumination module 1, the light emission angle that is the range in which the light intensity of the light emitted from the second surface 2b is maximum is based on the direction from the first end portion 21 toward the second end portion 22. It becomes larger than 0 degree | times and below 40 degree | times toward the said normal line direction. By using the light guide plate 2 having such a light emission angle, it is possible to reliably prevent the emission light from leaking to the non-illumination space side even when the illumination member 20 is in the open state. Moreover, since the rotation range of the illumination member 20 can be set according to the said light emission angle, illumination space can be illuminated efficiently.

[Embodiment 2]
The following describes one embodiment of the present invention with reference to FIGS. In addition, about the member similar to Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

<Lighting module 1a>
8A and 8B are diagrams for explaining the function of the illumination module 1a. FIG. 8A is a schematic diagram illustrating the overall configuration of the illumination module 1a. FIG. 8B is a schematic diagram illustrating a side cross-section of the illumination module 1a. is there. In addition, the area | region B of FIG.8 (b) shows in detail the part of the area | region B of Fig.8 (a).

  As shown in FIGS. 8A and 8B, the illumination module 1a (illumination device, window illumination device) is provided with the LED 4 facing the first end portion 21 and the hinge portion 10 is the first one. On the two end 22 side, the lighting member 30 is fixed to the window frame 11 so as to be rotatable about the second end 22 as an axis. Thereby, even if it is a case where the illumination member 30 which can be rotated is provided similarly to the illumination module 1, the fall of the radiation | emission efficiency to the illumination space of the light radiate | emitted from LED4 can be prevented. That is, even if the illumination member 30 is in the open state, the illumination space side can be efficiently irradiated.

  On the other hand, in the illumination module 1a, the illumination member 30 is provided with protective glasses 3a and 3b (first cover member, second cover member) disposed so as to face the first surface 2a and the second surface 2b, respectively. ) Is different from the lighting module 1. That is, in this illumination module 1a, the light emitted from the LED 4 is guided by the light guide plate 2 and is applied to both surfaces of the light guide plate 2 (the first surface 2a and the second surface 2b shown in FIG. 8B). The light is emitted from the facing protective glasses 3a and 3b to the outside of the illumination module 1a.

(Protective glass 3a and 3b)
The protective glass 3a is disposed to face the first surface 2a and protects the first surface 2a. Moreover, the protective glass 3b is arrange | positioned facing the 2nd surface 2b, and protects the 2nd surface 2b. That is, the protective glasses 3 a and 3 b are a pair of flat plates for protecting the light guide plate 2 provided substantially parallel to the first surface 2 a and the second surface 2 b of the light guide plate 2. In addition, like the light guide plate 2, it is not necessarily a flat plate.

  Further, the protective glasses 3a and 3b are fixed to the holding member 5 and the frame 6 via the buffer member 7 with, for example, an adhesive or a double-sided tape. Further, the protective glasses 3 a and 3 b sandwich the light guide plate 2 by being fixed by the holding member 5 and the frame 6.

  With this configuration, the light guide plate 2 is not exposed to the outside of the illumination module 1a. Therefore, the light guide plate 2 is prevented from being damaged due to scratches caused by external impacts (for example, wind and rain) or changes in the characteristics of the light guide plate 2 due to moisture absorption. Deterioration of the quality of the instrument can be prevented. In addition, it is possible to prevent the emission efficiency of light emitted from the light guide plate 2 from being lowered due to the entry of dust from the outside. That is, the influence from the outside of the illumination module 1a can be suppressed, and the impact resistance and convenience of the light guide plate 2 can be improved. Further, since the protective glasses 3a and 3b are arranged to face the first surface 2a and the second surface 2b, respectively, not only the influence from the non-illumination space (outdoor) side but also the illumination space (indoor ) Side influence can also be suppressed.

  Further, since the protective glasses 3a and 3b are provided so as to sandwich the light guide plate 2 and are flat plates, the installation space of the illumination module 1a can be reduced.

  The protective glasses 3a and 3b have translucency (transparency). Therefore, the light emitted from the light guide plate 2 can be emitted to the outside of the illumination module 1a.

  Furthermore, the protective glasses 3a and 3b have different light reflectivities. That is, the light reflectance of one of the protective glasses 3a and 3b is higher than the light reflectance of the other. This can be said that the light transmittance of one of the protective glasses 3a and 3b is lower than the light transmittance of the other. According to this configuration, when the LED 4 is turned on, the emission efficiency of the light emitted from the LED 4 in a predetermined direction (the direction of the protective glass having a low light reflectance when viewed from the light guide plate 2) can be improved. . The reason for this will be described later in <About the amount of emitted light>.

  The protective glass 3a and 3b may be made of any material as long as it has translucency and light reflectivity. For example, the same material as that of the light guide plate 2 can be used. From the viewpoints of properties and durability, it is preferably made of a glass material or a polycarbonate resin. The protective glasses 3a and 3b made of a glass material can also be called cover glasses.

  In general, a substance having complete light transmittance (light transmittance is 100%) does not actually exist, and no matter how high the light transmittance is, a part of the irradiated light on the surface of the substance. It has reflectivity to reflect the light. That is, light other than the transmitted component of the light irradiated to the protective glasses 3a and 3b becomes reflected light on the surfaces of the protective glasses 3a and 3b. Therefore, the protective glasses 3a and 3b have both light transmissivity (light transmissivity) and light reflectivity.

  Further, as described above, the protective glasses 3a and 3b according to the present embodiment have different light reflectances (that is, different light transmittances). In order to realize this configuration, each of the protective glasses 3a and 3b is made of a different material (for example, one is a glass material and the other is a polycarbonate), or has the same reflection characteristics but different reflection characteristics ( For example, the content of the light diffusing particles 2c is different in each of the protective glasses 3a and 3b).

  In particular, in the configuration in which the light guide plate 2 includes the light diffusing particles 2c, the main emission direction of the emitted light from the light guide plate 2 is relative to the normal direction of the first surface 2a and the second surface 2b that are the emission surfaces. (See FIG. 5). For this reason, by using a glass material for one of the protective glasses, the light reflectance can be made relatively high, and the effect of reflection (that is, improvement in the emission efficiency in the predetermined direction) can be expected.

  In consideration of practicality, that is, after sufficiently ensuring the light transmittance of the protective glasses 3a and 3b having a high light reflectance, the light from the protective glass 3a or 3b having a low light reflectance is reduced. In order to improve the emission efficiency, it is preferable that the protective glass having a higher light reflectance than the other of the protective glasses 3a and 3b has a light reflectance of 5% to 60%.

  Moreover, in this Embodiment, the magnitude | size of the protective glass 3a and 3b is substantially the same as the magnitude | size of the illumination module 1a whole, and the thickness is 3 mm.

  Furthermore, the protective glasses 3a and 3b may have a function of cutting, for example, UV (ultraviolet rays), IR (heat rays), or the like. When these functions are provided, a more practical lighting module 1a can be realized. In this case, for example, the protective glass 3a and 3b can be provided with the above function by depositing a substance having the above function on the protective glass 3a and 3b or by attaching a film having the above function. .

(Holding member 5)
The holding member 5 of this embodiment holds these members on the frame 6 and the base portion 8 by sandwiching the light guide plate 2 and fixing the protective glasses 3a and 3b. That is, the holding member 5 of the present embodiment has a common function in that the light guide plate 2 is held, like the holding member 5 of the first embodiment, but also holds the protective glasses 3a and 3b. The holding member 5 and each of the light guide plate 2 and the protective glasses 3a and 3b are fixed with, for example, an adhesive or a double-sided tape. In addition, you may fix these members by providing a screw hole in the predetermined position of the light-guide plate 2 and the protection glass 3a and 3b, and tightening a screw.

  8B, the holding member 5 fixes the second end 22 of the light guide plate 2 and the ends of the protective glasses 3a and 3b to each other.

  Here, when the light guide plate 2 and the protective glasses 3a and 3b are arranged so as to be in contact with each other, no matter how precisely they are fixed, the light guide plate 2 and the protective glasses 3a and 3b are interposed between them. There is a high possibility that minute irregularities are formed or bubbles are sandwiched between them. That is, the light guide plate 2 and the protective glasses 3a and 3b cannot be brought into close contact with each other, and a slight gap is formed between the members, which is caused by this gap (that is, nonuniformity in the degree of adhesion). Interference fringes or light scattering are likely to occur. In this case, the uniformity of the light emitted from the illumination module 1a is impaired.

  In the present embodiment, as shown in FIG. 8B, the light guide plate 2 and the protective glass 3a are separated from each other by fixing by the holding member 5, and the light guide plate 2 and the protective glass 3b are provided. Are spaced apart from each other. That is, a space S made of an air layer is formed between the light guide plate 2 and the protective glasses 3a and 3b. With this configuration, it is possible to prevent the light uniformity as described above from being impaired. That is, the influence (the influence on the optical performance of the light guide plate 2) caused by the protective glasses 3a and 3b with respect to the light guide component inside the light guide plate 2 can be eliminated, and the light guided by the light guide plate 2 is guided by the light guide plate 2. The light can be emitted to the outside of the light guide plate 2 only by the traveling direction changing mechanism such as the light diffusion particle 2c included in the light guide particle 2c. Moreover, the heat insulation effect improves more by providing an air layer.

  In this embodiment, in order to realize the fixing by the holding member 5 after being separated from each other, the shape of the holding member 5 is the horizontal direction in the side surface cross section (the z direction in FIG. 8B). ).

  If the light uniformity is not taken into consideration, the shape of the holding member 5 may be any shape that can hold the light guide plate 2 and the protective glasses 3a and 3b. The same applies to the size. Further, the holding member 5 is not provided, and the light guide plate 2 and the protective glasses 3a and 3b, and the protective glasses 3a and 3b and the frame 6 are directly attached and fixed, for example, with an adhesive or a double-sided tape. May be.

<About the amount of emitted light>
Next, the amount of light emitted from the illumination module 1a when the LED 4 is turned on will be described with reference to FIG. FIG. 9 is a diagram for explaining the functions of the protective glasses 3a and 3b according to the present embodiment. Specifically, FIG. 9 is a diagram for explaining the transparency and reflectivity of the protective glasses 3a and 3b.

  The illumination module 1a according to the present embodiment is arranged so as to partition an illumination space that is a main object of illumination and a non-illumination space that is a space other than the illumination space. For example, when the indoor or indoor side of a building is an illumination space and the outdoor or outdoor side is a non-illumination space, the illumination module 1a is arranged so as to partition the indoor or outdoor. Moreover, when the light reflectance of the protective glass 3a is higher than the light reflectance of the protective glass 3b, the illumination module 1a has the surface of the protective glass 3a facing the first surface 2a of the light guide plate 2 not illuminated. It arrange | positions so that the surface of the protection glass 3b facing the 2nd surface 2b of the light-guide plate 2 may contact | connect an illumination space (facing an illumination space) so that it may contact | connect a space (facing a non-illumination space). That is, the illumination module 1a is arrange | positioned so that the glass side for protection with high light reflectance among the glass for protection 3a and 3b may become non-illumination space.

  The reason why the illumination modules 1a having different light reflectances of the protective glasses 3a and 3b are arranged as described above will be described below. Below, it demonstrates on the assumption that the light-diffusion particle | grains 2c are distributed substantially uniformly inside the light-guide plate 2. FIG. That is, in the following description, the light emitted from the LED 4 is emitted from the first surface 2a and the second surface 2b of the light guide plate 2 at a substantially equal rate by being diffused by the light diffusion particle 2c. ing.

  As shown in FIG. 9C, when the protective glasses 3a and 3b are not provided, the emitted lights AO and AI emitted from the light guide plate 2 when the LED 4 is lit are as described above. It is diffused by the internal light diffusion particles 2c. As a result, the ratio of the amounts of outgoing light AO and AI emitted from the light guide plate 2 is approximately 1: 1 on the outdoor (non-illumination space) side and indoor (illumination space) side.

  That is, when the light emitted from the LED 4 is emitted uniformly from the first surface 2a and the second surface 2b of the light guide plate 2, when the protective glasses 3a and 3b are not provided, or Even if the protective glasses 3a and 3b are provided, if the reflectance of the protective glasses 3a and 3b is substantially the same, substantially the same amount of the emitted light AO and AI is applied to the outdoor side and the indoor side, respectively. The light is emitted to the outside of the illumination module 1a (that is, the intensity ratio between the emitted light AO and AI is substantially the same). In this case, since the emitted light AO is emitted from the light guide plate 2 in the non-illuminated space that is not the main target of illumination, the emitted light AO is emitted from the light guide plate 2 in almost the same amount as the illuminated space (about half of the light emitted from the LED 4). It can be said that the utilization efficiency of the emitted light as the emitted light AI to the illumination space that is the main object of illumination is low. That is, in the illumination module 1a intended to efficiently illuminate a predetermined direction, that is, the illumination space, the amount of the emitted light AO emitted to the outside of the illumination module 1a is lost.

  In the present embodiment, protective glasses 3a and 3b are provided. As shown in FIG. 9 (a), a part of the outgoing lights AO and AI emitted from the first surface 2a and the second surface 2b of the light guide plate 2, respectively, are provided by the protective glasses 3a and 3b. The light is reflected and re-enters the light guide plate 2 as reflected light BO and BI, and the other portions are transmitted through the protective glasses 3a and 3b and emitted to the outdoors or indoors as transmitted light CO and CI.

  Furthermore, in FIG. 9A, the light reflectance of the protective glass 3a is higher than the light reflectance of the protective glass 3b. Therefore, since the light quantity of the reflected light BO is larger than the light quantity of the reflected light BI, the difference between the light quantities is added to the emitted light AI and emitted as the transmitted light CI to the outside (indoor side) of the illumination module 1a. The That is, the light amount of the transmitted light CI is the light amount of the outgoing light A0 + (the light amount of the reflected light BO−the light amount of the reflected light BI), which is compared with the case of FIG. ) Can be increased. That is, by converting a part of the light emitted from the first surface 2a into light for indoor lighting by the protective glass 3a, compared to the case of FIG. 9C, (amount of reflected light BO−reflected light). The indoor side can be brightened by the amount of light BI).

  On the other hand, the light quantity of the outgoing light (transmitted light CO) to the outdoor side is the light quantity of the outgoing light AO minus the light quantity of the reflected light BO. Therefore, compared with the case of FIG.9 (c), the light quantity of the emitted light (transmitted light CO) to the outdoor side can be decreased. That is, the above-described loss can be reduced.

  In other words, as described above, by arranging the illumination module 1a so that the protective glass having low light reflectance (high light transmittance) is on the illumination space side, from the light guide plate 2 to the non-illumination space side. The amount of light reflected from the protective glass is increased (that is, the amount of light transmitted is suppressed), and the light emitted from the light guide plate 2 toward the illumination space is reflected by the protective glass. The amount of transmission can be increased (that is, the amount of reflection of the light can be suppressed). That is, the illumination module 1a uses the amount of light emitted from the protective glass having a low light reflectance to the illumination space, and the amount of light emitted from the protective glass having a high light reflectance to the non-illumination space. Can be more.

  Therefore, even when the light guide plate 2 that emits substantially the same amount of light from the first surface 2a and the second surface 2b is provided, a part of the light emitted to the non-irradiation space is irradiated on the irradiation space side. It becomes possible to turn to. That is, the intensity of the outgoing light (transmitted light CI) toward the indoor side can be made stronger than the intensity of the outgoing light (transmitted light CO) toward the outdoor side. Therefore, the emission efficiency on the illumination space side can be improved, and the utilization efficiency of the light emitted from the LED 4 can be improved. That is, when the LED 4 is turned on, the illumination space side can be illuminated brighter than the non-illumination space side.

  Thus, in the illumination module 1a of the present embodiment, even if the light emitted from the first surface 2a and the second surface 2b of the light guide plate 2 (light emitted from the LED 4) is uniform, Part of the light emitted from the first surface 2a is reflected by the protective glass 3a, then passes through the light guide plate 2 and becomes light emitted from the second surface 2b. Therefore, even when light is emitted uniformly from the first surface 2a and the second surface 2b, the second surface 2b disposed on the illumination space side can function as a light emitting surface. .

  Moreover, although the above demonstrated the case where light was radiate | emitted equally from the 1st surface 2a and the 2nd surface 2b, the illumination module 1a of Embodiment 2 is one side of the light-guide plate 2 similarly to Embodiment 1. FIG. This is also applicable to the case where the surface functions as a light emitting surface (mainly when light is emitted from the surface). In this case, by disposing the protective glass 3a having higher light reflectance than the protective glass 3b on the first surface 2a side, the light leaked from the first surface 2a of the light guide plate 2 is protected. The light can be emitted from the second surface 2b as the light emission surface. Therefore, in this case, leakage to the non-illumination space side can be reliably prevented, and the utilization efficiency of the light emitted from the LED 4 to the illumination space can be further improved.

  Therefore, similarly to the illumination module 1, the illumination module 1a prevents the light emitted from the light exit surface of the light guide plate 2 from being lowered into the illumination space even when the illumination member 30 is in the open state. Can do. Further, in the illumination module 1a, even if the light guide plate 2 emits light evenly from both surfaces thereof, the surface of the light guide plate 2 facing the protective glass having a lower light reflectance is used as the light emission surface. Can function. Further, as in the first embodiment, when one surface of the light guide plate 2 functions as a light exit surface even without the protective glasses 3a and 3b, the light reflectance is opposite to the light exit surface. By disposing the lower protective glass and placing the protective glass in contact with the illumination space, leakage of light emitted from the light guide plate 2 to the non-illumination space can be reliably prevented.

  When the light reflectance of the protective glass 3b is higher than the light reflectance of the protective glass 3a, the protective glass 3b is in contact with the non-illuminated space and the protective glass 3a is in the illumination space. If it is installed so as to be in contact with, the same effects as described above can be obtained. In this case, the first surface 2a functions as a light emitting surface. That is, one of the first surface 2a and the second surface 2b functions as a light emitting surface.

<Modification>
Next, based on FIG. 10, the illumination module 1b which is a modification of the illumination module 1a is demonstrated. 10A and 10B are diagrams for explaining the function of the illumination module 1b. FIG. 10A is a schematic diagram illustrating the overall configuration of the illumination module 1b. FIG. 10B is a schematic diagram illustrating a side cross-section of the illumination module 1b. is there. Note that the region C in FIG. 10B illustrates the portion of the region C in FIG. 10A in more detail.

  As shown in FIGS. 10A and 10B, the illumination module 1b (illumination device, window illumination device) is provided with the LED 4 facing the first end 21 and the hinge portion 10 is On the second end 22 side, the illumination member 40 is fixed to the window frame 11 so as to be rotatable about the second end 22 as an axis. Therefore, similarly to the illumination modules 1 and 1a, the illumination space side can be efficiently illuminated even when the illumination member 40 is in the open state.

  On the other hand, in the lighting module 1b, the lighting member 40 includes a protective glass 3a disposed to face the first surface 2a (that is, the protective glass 3b is disposed on the second surface 2b side). It is different from the illumination member 30 in that it is not). Even with this configuration, at least the influence from the non-illuminated space (outdoor side) (impact from outside such as wind and rain described above, intrusion of dust from outside, etc.) can be suppressed. And this illumination module 1b partitions an illumination space and a non-illumination space, and is arrange | positioned so that the glass 3a for protection may face a non-illumination space.

  Hereinafter, based on FIG. 9, the emitted light quantity of the illumination module 1b at the time of lighting of LED4 is demonstrated.

  As shown in FIG. 9B, the emitted light AI emitted from the second surface 2b of the light guide plate 2 is emitted to the indoor side. On the other hand, part of the outgoing light AO emitted from the first surface 2a is reflected by the protective glass 3a and reenters the light guide plate 2 as reflected light BO, and the other parts are Then, the light passes through the protective glass 3a and is emitted to the outdoors as transmitted light CO.

  The reflected light BO passes through the light guide plate 2 and is added to the outgoing light AI. That is, the light amount of the emitted light AI + the reflected light BO is the amount of light emitted from the light guide plate 2 toward the illumination space. Therefore, compared with the case of FIG. 9C, the amount of emitted light to the illumination space can be increased. That is, compared to the case of FIG. 9C, the indoor side can be brightened by the amount of the reflected light BO.

  On the other hand, the light quantity of the outgoing light (transmitted light CO) toward the non-illumination space is the quantity of outgoing light AO minus the quantity of reflected light BO. Therefore, compared with the case of FIG.9 (c), the light quantity of the emitted light (transmitted light CO) to the outdoor side can be decreased.

  Therefore, similarly to the illumination module 1a, the illumination module 1b prevents the light emitted from the light exit surface of the light guide plate 2 from being lowered into the illumination space even when the illumination member 40 is in the open state. In addition, even if the light guide plate 2 emits light equally from both surfaces thereof, the second surface 2b on the illumination space side can function as a light emitting surface. Moreover, when the 2nd surface 2b is functioning as a light-projection surface like Embodiment 1, it arrange | positions so that the 2nd surface 2b may face illumination space, and the protection glass 3a may face non-illumination space. By doing so, it is possible to reliably prevent light emitted from the light guide plate 2 from leaking to the non-illumination space.

  The light transmittance of the protective glass 3a is preferably 50% or more. In this case, it is possible to maintain better daylighting and to increase the light intensity of the light emitted from the second surface 2b.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention has a daylighting property when the light source is not lit, and illuminates a predetermined direction with light emitted from the light source when lit, and can be suitably used as a member used in a structure that can be opened and closed. In particular, it can be suitably used as a skylight or the like.

1. Lighting module (lighting device, window lighting device)
1a Lighting module (lighting device, window lighting device)
1b Lighting module (lighting device, window lighting device)
70 Lighting module (lighting device, window lighting device)
2 Light guide plate (light guide)
2a First surface (light exit surface)
2b Second surface (light exit surface)
2c Light diffusion particles (travel direction change mechanism, light diffusion material)
3a Protective glass (first cover member, second cover member)
3b Protective glass (first cover member, second cover member)
4 LED (light source)
6 frames
10 Hinge (fixing member)
11 Window frame (attachment target)
12 angle holding member 20 lighting member 21 first end 22 second end 30 lighting member 40 lighting member 71 ceiling (attachment target)

Claims (10)

A first end, a second end that is the end opposite to the first end, and a light exit surface that emits light guided from the first end toward the second end. A light guide having,
A light source disposed opposite the first end and emitting light to the first end;
An illumination member comprising: a traveling direction changing mechanism that is disposed in or near the light guide, changes a traveling direction of light guided through the light guide, and emits the light from the light exit surface;
The second end portion includes a fixing member that fixes the illumination member so as to be rotatable about the second end portion with respect to an attachment target to which the illumination member is attached. apparatus. The lighting device is arranged so as to partition an illumination space that is a main target of illumination and a non-illumination space that is a space other than the illumination space,
The fixing member enables the lighting member to be opened and closed between the illumination space and the non-illumination space by fixing the illumination member rotatably at the second end,
The lighting device according to claim 1, wherein the lighting member is arranged such that the light emitting surface faces the lighting space when the lighting member is in a closed state. The lighting device functions as a window lighting device attached to a building window,
The lighting space is a room in a room provided inside the building,
The lighting device according to claim 2, wherein the non-lighting space is outside the room.   The illumination device according to any one of claims 1 to 3, further comprising an angle holding member that holds the illumination member so that a rotation angle of the illumination member is constant. A frame disposed so as to surround the entire end of the light guide;
The lighting device according to claim 1, wherein the fixing member is attached to the frame.   The light emission angle, which is the range in which the light intensity of the light emitted from the light emission surface of the light guide is maximized, is based on the direction from the first end portion to the second end portion. The illumination device according to claim 1, wherein the illumination device is greater than 0 degree and equal to or less than 40 degrees toward the normal direction.   The illumination according to any one of claims 1 to 6, wherein the traveling direction changing mechanism is a light diffusing substance that diffuses light emitted from the light source and is included in the light guide. apparatus. The light guide has a first surface and a second surface that is a surface opposite to the first surface, and one of the first surface and the second surface is , The light exit surface,
A first cover member disposed facing the first surface and protecting the first surface;
A second cover member disposed opposite to the second surface and protecting the second surface,
The lighting device according to claim 1, wherein the first cover member and the second cover member have translucency and have different light reflectivities. . The lighting device is disposed so as to partition an illumination space that is a main target of illumination and a non-illumination space that is a space other than the illumination space, and the light exit surface is the second surface,
The surface of the first cover member opposite to the surface facing the light guide is in contact with the non-illumination space,
The surface of the second cover member opposite to the surface facing the light guide is in contact with the illumination space,
The lighting device according to claim 8, wherein the light reflectance of the first cover member is higher than the light reflectance of the second cover member. The light guide and the first cover member are provided apart from each other,
The lighting device according to claim 8 or 9, wherein the light guide and the second cover member are provided apart from each other.

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