JP2013030279A - Planar lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar lighting system easy to construct with its small thickness, doing away with vertical frames at least in a display surface and equipped with a light-emitting face of a continuous large area uniformly emitting light.SOLUTION: The planar lighting system consists of a surface plate arranged on a surface side, a diffusion part arranged at a rear side of the surface plate, and a light source arranged at a rear side of the diffusion part. The diffusion part is formed of such a film material that light irradiated from the light source becomes diffused light uniformly incident onto the whole part of the surface plate.

Description

  The present invention relates to a planar lighting device.

  Conventionally, a device (referred to as a light wall) that emits light from the entire surface used for large display devices that display advertisements, etc., and flat illumination devices that are placed indoors or outdoors such as ceilings, floors, and walls of buildings. Is known).

  As such a planar lighting device, for example, in a large signboard or display device, a fluorescent lamp is used as a light source, and a large number of fluorescent lamps are arranged on the back side of a surface plate made of an acrylic plate or decorative glass. There are known ones that use LEDs (Light Emitting Diodes) as light sources and LEDs that are arranged at high density on a flat surface behind the surface plate. Alternatively, for example, a minute unevenness is formed in the surface of an acrylic plate, a glass plate or the like to form a light guide plate, and a light source such as an LED is disposed on the side surface (small edge) of the light guide plate, and is incident from the side surface of the light guide plate. There are known light sources that are devised so that light is uniformly emitted by changing the angle of light into the plane of the light guide plate.

  Further, for example, a plate material having an action of diffusing light, such as a milky white acrylic plate, is used as the diffusion plate, light from the light source is incident from the side surface of the light guide plate as described above, and light emitted from the light guide plate is transmitted by the diffusion plate. 2. Description of the Related Art There is known a planar lighting device that includes a light source, a light guide plate, and a diffusion plate that diffuses and emits light uniformly.

  For example, in Patent Document 1, an LED is used as a light source, light is incident on the LED from the side surface of the light guide plate, and light emitted from the light guide plate is diffused by the diffusion plate on a plane. An LED lighting unit is disclosed that is arranged in two line symmetry.

Utility Model Registration No. 3152140

  However, in the case where the light source is disposed behind the conventional surface plate and the light from the light source is directly incident on the surface plate, the shape of the light source is clearly recognized when the distance between the surface plate and the light source is short. Or the brightness of the entire surface plate may become uneven. Therefore, in order to uniformly brighten the entire surface plate, the distance between the surface plate and the light source must be increased. However, when the distance between the surface plate and the light source is increased, the thickness of the planar lighting device increases, and the installation location of the lighting device is restricted, or the thickness of the lighting device after installation becomes an obstacle. There is.

  For example, when light from the light source is incident from the side surface of the light guide plate and the entire light guide plate is caused to emit light, the brightness should be uniform on the side of the light guide plate near the light source and on the side far from the light source. There is a problem that it is difficult. Furthermore, when the size of one light guide plate is limited, the cost is high, and a large lighting device is formed by connecting a plurality of light guide plates, a frame material for fixing the plurality of light guide plates is required. There is a problem in that the surface plate is divided into a plurality of portions, so that one large continuous display surface cannot be formed and the appearance is deteriorated.

  Also, when a diffuser plate is arranged between the light source and the surface plate to diffuse the light and make it uniform, the size of the diffuser plate is still limited, and the cost is high. If a large illuminating device is to be formed in a continuous manner, a frame material for fixing a plurality of diffusion plates is required, and there are problems such as poor appearance as described above.

  The present invention has been made in view of such circumstances, and the thickness of the device is small, the construction is easy, and at least a vertical frame is not required in the display surface. It aims at providing the planar illuminating device which has.

  In order to achieve the above object, a planar lighting device according to the present invention is provided with a surface plate disposed on the front surface side, a diffusion portion disposed on the rear side of the surface plate, and a rear side of the diffusion portion. And the diffusing section is formed of a film material that diffuses the light emitted from the light source so as to be diffused light that is uniformly incident on the entire surface plate.

  As a result, the diffused portion is formed of a film material, so that the surface illumination device can be reduced in weight and can be reduced in thickness, easy to construct, and at least no vertical frame is required in the display surface. In addition, it is possible to obtain a planar lighting device having a continuous large-area light emitting surface that emits light uniformly.

  Moreover, as one embodiment, the film material is installed by suspending a long milky white film material having a certain width from above while fixing the upper part and attaching a weight to the lower end part. It is preferable.

  As a result, the film material forming the diffusion portion is a roll-shaped film material, and is installed by being suspended from above, so that the construction is easy and the vertical direction without the need for a frame material for connection. It can be extended as much as possible, and a planar lighting device having a continuous large-area light emitting surface can be formed.

  Moreover, as one embodiment, it is preferable that the film materials are attached so as to be at least two sheets at the front and back, and are arranged in a staggered manner so as to be shifted in the front and rear directions so that approximately half of the width thereof overlaps.

  As a result, the diffusing portion can form a continuous large-area light emitting surface not only in the vertical direction but also in the horizontal direction without making the joints conspicuous.

  In one embodiment, the membrane material is preferably a fluorine film.

  Accordingly, the use of the fluorine film has a high diffusion effect, allows light to be diffused well at a short distance from the light source, and makes it possible to reduce the thickness of the planar lighting device. Moreover, it is hard to get dirt by the action of fluorine.

  Moreover, as one embodiment, it is preferable that the light source is a surface-emitting light source configured to irradiate light incident from an LED from a side surface of the light guide plate.

  Thereby, uniform light can be emitted.

  In one embodiment, the light guide plate is preferably made of glass.

  Thereby, uniform light can be irradiated efficiently.

  Moreover, as one embodiment, it is preferable that the surface plate and the diffusion portion do not have a vertical frame member for holding each member within at least the surface of the surface plate.

  Thereby, since there is no frame material in the surface, it is possible to obtain a good-looking planar illumination device having a continuous light emitting surface without an obstacle.

  As described above, according to the present invention, by forming the diffusion portion with a film material, it is possible to reduce the thickness of the planar lighting device and reduce its thickness, and the construction is easy. It is possible to provide a planar lighting device having a light emitting surface that emits light continuously and has a large area and does not require a vertical frame in at least a display surface.

The perspective view which shows the schematic structure of the whole of one Embodiment of the planar illuminating device of this invention. The exploded perspective view which expands and shows a part of planar illumination device Sectional view with a plane parallel to the floor of the planar lighting device (A), (B) is side sectional drawing which shows the device of the installation method of the planar illuminating device of this invention The exploded perspective view which expands and shows a part of other example of a planar illuminating device The perspective view which shows the outline of an example of the conventional planar illuminating device.

  Hereinafter, a planar illumination device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an overall schematic configuration of an embodiment of a planar illumination device of the present invention.

  The planar lighting device 1 shown in FIG. 1 is installed on a wall surface of a building entrance or a lobby, for example, and is used as a monument as a so-called “light wall” in which the entire surface is uniformly illuminated by a light source and creates a certain atmosphere. .

  The planar illumination device 1 is configured by arranging a planar light source 10 on the back surface, a surface plate 12 on the front surface, and two (double) diffusion films (diffusion films) 14 in the middle. ing. However, the front surface plate 12 may be transparent glass or milky white decorative glass in which the glass itself diffuses light.

  The planar lighting device 1 is used by being installed on the wall of a building entrance or a lobby as described above, and the size of the display surface is, for example, a size of 3 m long by 7 m wide. However, the size is not limited to this, and it may be larger according to the environment of the installation location.

  The planar lighting device 1 is installed so as to be suspended from, for example, an upper frame spanned on a support column standing in front of a wall surface. In that case, a holding frame may be provided on each of the floor and the ceiling.

  The light source 10 may be any planar light source (surface light emitter) that uniformly irradiates the entire surface of the surface plate 12. For example, fluorescent lamps or LEDs may be arranged in a plurality of planes, or using a light guide plate, light is incident on the light guide plate from the side surface (small edge) of the light guide plate, and light is emitted from the surface of the light guide plate. It may be what you do.

  The diffusion film (diffusion film) 14 is arranged so that the upper end of the long diffusion film is used as an upper frame and a weight is attached to the lower end of the diffusion film so as to be suspended from above. In view of construction, it is preferable to wind a long diffusion film in a roll shape, hold the roll-shaped diffusion film on the upper frame, and hang it on the lower end by the required length. The diffusion film is preferably a milky white film. In this way, the weight of the apparatus can be reduced by using a film (film material) -like diffusion portion, and a vertical frame for holding the diffusion film 14 is not required by hanging from above. It can be. Further, as described above, since the film (film) is simply hung from above, the lengthwise direction can be extended as long as there is no joint.

  Moreover, when suspending the diffusion film 14, it is preferable to arrange the front and rear films so as to form a staggered pattern by shifting them by half of their width. When arranged in a zigzag manner in this way, the boundary between adjacent films does not have to be noticeable.

  As the diffusion film 14, it is particularly preferable to use a fluorine film. Since the diffusion effect is further enhanced by using a fluorine film and using it repeatedly as described above, it is possible to reduce the distance from the light source 10, and conventionally, the distance from the light source to the surface plate (decorative glass) However, the thickness of the apparatus that required about 500 mm can be set to about 150 mm, and the thickness of the planar lighting device 1 can be greatly reduced. In addition, the diffusion film 14 is always exposed to air and thus easily contaminated. However, the use of a fluorine film has an advantage that the diffusion film 14 can be hardly contaminated.

  Further, the surface plate 12 is not particularly limited, but it is preferable to use a decorative glass suitable for the atmosphere of the place where the planar lighting device 1 is used. In addition to glass, natural stone such as marble that transmits light may be used.

  FIG. 2 is an enlarged perspective view showing a part of the planar lighting device 1 in an enlarged manner. FIG. 3 shows a cross-sectional view of a surface of the planar lighting device 1 that is parallel to the floor surface.

  As shown in FIG. 2, the surface plate 12 is preferably a decorative glass having a decorative surface, and is fixed while being held up and down by a decorative glass upper frame 16a and a decorative glass lower frame 16b. The upper part of the diffusion film 14 is held by an upper frame 18a for diffusion film, and a weight (lower weight) 18b is attached to the lower end part and is suspended from above.

  In this way, the diffusion film 14 only hangs vertically due to its own weight, and even when the weight (lower weight 18b) is hung, it is a soft film material so that operations such as drilling can be performed on the spot. Since it can be cut or fixed as appropriate with a simple fixing tool such as a tucker or stapler, it is excellent in field workability.

  In addition, since the diffusion film 14 is such a film-like material, it is easy to use a plurality of layers in order to enhance the diffusion effect, and as in the present embodiment, the two front and back are arranged in a staggered manner, When a plurality of sheets are stacked, it is possible to reduce the conspicuousness of the joint by shifting the joint between the front surface side and the back surface side.

  Here, it is assumed that the light source 10 includes a light guide plate 20, an LED 22, and a reflection plate 24. That is, an LED 22 is disposed at least at one side of the light guide plate 20, and a surface emitting light source that emits light from the entire surface of the light guide plate 20 by making light incident from the side surface of the light guide plate 20 is configured. In general, an acrylic plate is often used as the light guide plate 20, but here, the light guide plate 20 is formed of glass, and light enters from the side surface of the glass.

  At this time, a reflector 24 is provided to efficiently use the light of the LED 22. Although not shown here, frames that hold the upper and lower sides of the light source 10 are also installed above and below the light source 10. You may attach a vertical frame to the light source 10 as needed.

  Moreover, as shown in FIG. 3, the planar lighting device 1 is installed in front of the wall surface 30 of the building. Here, although not shown in the figure, a self-supporting column is set up in front of the wall surface 30 and the planar lighting device 1 is installed so as to be suspended from a frame provided on the upper part.

  As shown in FIG. 3, a plurality of light sources 10 including a light guide plate 20, LEDs 22 arranged on opposing side surfaces of the light guide plate 20, and a reflection plate 24 are arranged side by side along a wall surface 30. Then, two diffusion films 14 are arranged in front of the light source 10 and arranged in a staggered manner so as to be shifted by about half of the lateral width of the front and rear diffusion films 14 so that the borders between adjacent ones do not overlap each other. .

  Here, the diffusion film 14 is a thin film and is light. Therefore, the diffusion film 14 is mounted with a lower weight 18b attached to the lower end portion and suspended from the diffusion film upper frame 18a. Accordingly, there is no need for a vertical frame (vertical frame member) that is disposed between adjacent diffusion films 14 and holds and fixes adjacent diffusion films 14 to each other.

  A plurality of surface plates 12 (decorative glass) are arranged side by side on the front surface. As shown in FIG. 2, the surface plate 12 is suspended from above by a surface plate upper frame 16a, and the lower side is held by a surface plate lower frame 16b. Since no frame (vertical frame) is provided between the adjacent surface plate 12, a gap between the adjacent surface plate 12 and the adjacent surface plate 12 is filled with a joint seal 26. The joint seal 26 is particularly preferably transparent so that the boundary (joint) between the adjacent surface plates 12 is not noticeable.

  Thus, in this embodiment, since there is no vertical frame between the surface plates 12 adjacent to each other and between the adjacent diffusion films 14, the boundary between the adjacent surface plates 12 and the diffusion film 14 ( It is possible to form a continuous large-area light wall that is not conspicuous and has a good appearance.

  In order to compare this with a conventional planar illumination device, FIG. 6 shows a conventional planar illumination device (light wall).

  As shown in FIG. 6, the conventional planar lighting device 100 is configured such that a planar light source 110 is disposed on the back surface, a glass 112 is disposed on the front surface, and a diffusion plate 114 such as an acrylic plate is disposed in the middle. Has been.

  In addition, since the conventional diffusion plate 114 is formed of an acrylic plate or the like, it is heavy and requires a vertical frame (vertical frame member) 126 for holding and fixing.

  Therefore, in the conventional planar lighting device 100, the vertical frame 126 is reflected on the surface glass 112, and vertical lines are formed on the surface, so that the surface brightness is not uniform and a continuous light wall is obtained. It will not look good.

  Moreover, the device of the installation method of the planar illuminating device 1 of this invention is shown in FIG. 4A and 4B are side sectional views of the planar illumination device 1, respectively.

  As shown in FIG. 4A, the upper plate 16a for holding the surface plate 12 on the upper side is positioned above the upper frame 28a for holding the light source 10 on the upper side. If the front plate lower frame 16b that is held by the light source 10 is positioned below the light source lower frame 28b that holds the light source 10, the upper and lower ends of the front plate 12 are inevitably indicated by hatching S in the figure. As described above, the light from the light source 10 does not reach much and shadows are generated, and the entire surface plate 12 cannot be made uniform in brightness.

  Therefore, as shown in FIG. 4B, the position of the top plate 16a for holding the top plate 12 is lowered and the position of the bottom frame 16b for holding the top plate 12 is raised. Thus, by making each position at least as large as the light source upper frame 28a and the light source lower frame 28b, the entire surface of the surface plate 12 is irradiated in the same manner, so that the upper end of the surface plate 12 is In addition, it is possible to prevent the occurrence of shadows at the lower end portion, and to make the entire surface plate 12 uniform brightness.

  FIG. 5 shows another example of the planar illumination device of the present invention. FIG. 5 is an exploded perspective view showing an enlarged part of a planar illumination device according to another example.

  The planar illumination device 1 ′ shown in FIG. 5 is different from the planar illumination device 1 described above in that the light source 10 ′ has a large number of LEDs arranged in a planar shape.

  Other configurations such as the surface plate 12 and the diffusion film 14 are the same as those of the planar illumination device 1 described above. That is, the top plate 12 is held up and down by the top plate top frame 16a and the top plate bottom frame 16b, and the diffusion film 14 is held at the top by the diffusion film top frame 18a and the lower weight 18b at the lower end. It is mounted and suspended, and is arranged so that the two front and back overlap in a staggered manner.

  Furthermore, the light source 10 'may be a plurality of fluorescent lamps arranged in a plane. Regardless of which light source is used, the diffusion film is thin and highly diffusive, so that the distance from the light source can diffuse light at least sufficiently, and uniform brightness can be obtained over the entire surface. A planar illumination device can be obtained. Moreover, since it is only necessary to hang it from the top because it is a film, there is no need for a vertical frame member, and there is no shadow of the frame member in the surface.

  The planar lighting device according to the present invention has been described in detail above, but the present invention is not limited to the above examples, and various improvements and modifications may be made without departing from the scope of the present invention. Of course.

  DESCRIPTION OF SYMBOLS 1 ... Planar illuminating device, 10 ... Light source, 12 ... Surface plate (decorative glass), 14 ... Diffusion film (diffusion film), 16a ... Upper frame for surface plates, 16b ... Lower frame for surface plates, 18a ... For diffusion films Upper frame, 18b ... lower weight, 20 ... light guide plate, 22 ... LED, 24 ... reflector, 28a ... upper frame for light source, 28b ... lower frame for light source, 30 ... wall surface

Claims (7)

A surface plate arranged on the surface side;
A diffusion part disposed on the rear side of the surface plate;
A light source arranged on the rear side of the diffusion part,
The planar illumination device, wherein the diffusion unit is formed of a film material that diffuses the light emitted from the light source so as to be diffused light that is uniformly incident on the entire surface plate.   2. The film material is characterized in that a long milky white film material having a certain width is fixed by attaching a weight to a lower end portion and suspended from above. The surface illumination device described in 1.   The planar illumination according to claim 2, wherein the film materials are attached so as to be at least two in the front and rear directions, and are arranged in a staggered manner so as to be shifted in the front and rear directions so that approximately half of the width thereof overlaps. apparatus.   The planar lighting device according to claim 3, wherein the film material is a fluorine film.   The planar illumination device according to any one of claims 1 to 4, wherein the light source is a surface-emitting light source configured to irradiate light incident from an LED from a side surface of the light guide plate from the surface thereof.   The planar lighting device according to claim 5, wherein the light guide plate is made of glass.   The said surface plate and the said spreading | diffusion part do not have the vertical frame material for hold | maintaining each member in the range of the surface of the said surface plate at least. The surface illumination device described.

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