JP4646245B2 - Reflective lighting device - Google Patents

Description

  The present invention relates to an illuminating device using a surface emitting light source represented by, for example, an organic EL (electroluminescence) element, and more particularly to a reflection type illuminating device in which light from the surface emitting light source is reflected by a reflecting plate.

  The lighting device has a long history, and conventionally, a filament light bulb as a point light source, a fluorescent light as a line light source, and the like are frequently used. In the illumination device using these conventional light sources, it is necessary to mechanically hold each light source and include ancillary parts such as a socket for individually supplying power to each light source. However, there is a problem that the lighting device becomes large and the cost increases.

  Further, in the case where it is intended to realize a reflective illumination device using the above-mentioned light source, that is, indirect illumination, a light shielding member for hiding the light source from the illumination space side is disposed between the light source and the illumination space, thereby The illumination space is illuminated with reflected light from the wall surface or ceiling surface. For this reason, in order to realize reflection type illumination using the above-described conventional light source, the size of the illumination device is further increased.

  Therefore, in the above-described conventional reflective illumination device, even if this is adopted in a general Japanese-style room, Western-style room, living room, etc., the result is that the occupant is rather pressed and uncomfortable. Therefore, the above-described conventional reflective illumination device has a limited range of use, for example, in public buildings or large indoor spaces.

  By the way, in recent years, an organic EL element that functions as a surface light emitting source has attracted attention. This organic EL element has high luminous efficiency when driven by a low voltage, and can be reduced in weight and thickness. Therefore, it is used for flat panel displays (FPD) in some portable devices. There is also provided a configuration in which the element is used as a surface light source, for example, as a backlight of a liquid crystal display element.

  On the other hand, the organic EL element can obtain each emission color of R (red), G (green), and B (blue) by selecting the material used for the EL emission layer. Alternatively, by combining two or more kinds of emission colors, it is possible to obtain white or an emission color close to this. Therefore, by configuring the organic EL element as a surface light source (light emitting panel), for example, it can be used as a light source for decoration or a highly efficient light source for illuminating a room or the like.

Patent Documents 1 to 3 and the like disclosed below make use of the characteristics of the organic EL element described above and use it as a surface-emitting illumination device.
JP-A-10-169075 JP 2003-7450 A JP 2004-234868 A

  By the way, the illumination device disclosed in Patent Document 1 uses an organic EL element as a surface light source, and lays it over the entire ceiling or wall surface of a house to make it difficult to produce a shadow. . Further, in the illumination devices disclosed in Patent Documents 2 and 3, when an organic EL element is used as a surface light source, it is an object to mainly solve the problem of luminance unevenness. is there.

  Therefore, in each of the lighting devices disclosed in Patent Documents 1 to 3, the idea is to use the organic EL element as a monotonous surface light source.

  The present invention is intended to provide a lighting device that realizes a reflection type, that is, indirect lighting, by taking advantage of the characteristics of a surface-emitting light source typified by the organic EL element described above. It is an object of the present invention to provide an illumination device that is excellent in decorative effect and can be used to create a good atmosphere and produce effects when used in a living room or the like.

The reflective illumination device according to the present invention, which has been made to solve the above-described problems, includes a reflector having a hanging portion formed on the back surface, and a light toward the reflector plate facing the front surface of the reflector. A flat illumination board having a surface light emitting unit for projecting light, and a support unit that is interposed between the reflector and the illumination board and supports the illumination board so as to face the front surface of the reflector. The reflector is flat and formed in a rectangular shape, and is curved in a bowl shape or a bowl shape so that the front side is concave, and the illumination substrate is formed in a rectangular shape and the surface The light emitting part is composed of an organic EL element, and the supporting means is composed of four wires or chains suspended from four different points on the front surface of the reflecting plate, and each lower end of the wire or chain is the illumination substrate. each corner of Having features the illumination substrate is connected to the point of supporting the suspended state immediately below the reflector.

In this case, the organic EL elements constituting the surface emitting part in good preferable form is to divided into a plurality unit on the illuminating board.

On the other hand, the illuminating board is not to want to be composed by a light transmissive material. In addition, in a preferred embodiment, the reflecting plate is made of wood, and a light transmissive thin film is formed at least on the front surface of the reflecting plate.

  According to the reflection type illumination device described above, for example, a flat illumination substrate that projects light onto a reflection plate suspended from the ceiling is supported so as to face the front surface of the reflection plate. In this case, for example, the flat illumination substrate includes a surface light emitting unit made of an organic EL element, so that light emitted from the organic EL element is irradiated toward the reflection plate, and reflected light from the reflection plate is reflected in the illumination space. It is possible to provide a reflection type lighting device projected on the screen.

  According to the reflection type illumination device described above, the size of the illumination device, particularly in the height direction, can be shortened, and thereby the size and weight can be reduced. Further, by using a light-transmitting substrate as the lighting substrate and arranging an organic EL element divided into a plurality of units on the lighting substrate, it is possible to create an atmosphere with an excellent decorative effect and a good atmosphere. It is possible to provide a reflective illumination device that can achieve a production effect.

  Therefore, according to the reflection type illumination device described above, it is possible to realize harmonious indirect illumination that does not cause a feeling of pressure or discomfort, especially when used in a Japanese-style room, a Western-style room, a living room, etc. in a general household.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a reflective illumination device according to the present invention will be described based on an embodiment shown in the drawings. FIG. 1 shows a first embodiment in which the illumination device according to the present invention is configured as a suspended type, as viewed from obliquely below, and FIG. 2 shows the second embodiment from the obliquely downward direction. It is shown in a state of viewing. FIG. 3 is a side view of the lighting device shown in FIG. 1 as viewed from the horizontal direction.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a flat reflecting reflector formed in a rectangular shape, and hung at the center of the back of the reflector 1 configured as a hanging type illumination device as shown in FIG. A lowering portion 1a is attached. The hanging part 1a is connected to a hanging tool h such as a chain suspended from a ceiling surface (not shown).

  The reflector 1 according to the first embodiment shown in FIG. 1 and FIG. 3 is formed in a bowl shape curved in a uniaxial direction along the surface so that the front side (the lower side in the figure) is a concave surface. ing. Moreover, the said reflector 1 concerning 2nd Embodiment shown in FIG. 2 is formed in the saddle type curved in the biaxial direction orthogonal to a surface so that the front side may become a concave surface.

  Reference numeral 2 denotes an illumination board that is flat and formed in a rectangular shape (in this example, a square), and the illumination board 2 is made of a light-transmitting material such as glass. Each corner portion of the illumination board 2 is supported by suspension wires or chains 3a, 3b, 3c, 3d that constitute support means suspended from the front surface of the reflection plate 1. Thus, the illumination board 2 is suspended by the wires or chains 4a, 4b, 4c, 4d so as to face the front surface of the reflector 1, and in the example shown in the figure, the illumination board 2 has a surface thereof. It is supported to be in a horizontal state.

  On the illumination substrate 2, surface light emitting portions 4a, 4b, 4c, and 4d that project light toward the front surface (the concave surface) of the reflection plate 1 are formed. As shown in the drawing, the surface light emitting portion is divided into four units, and each unit is formed in a circular shape having substantially the same diameter. Each of the surface light emitting portions 4a, 4b, 4c, and 4d is composed of an organic EL element, as will be described in detail later.

  FIG. 4 is an enlarged cross-sectional view showing an example of a laminated structure of one organic EL element as a surface light emitting portion formed on the illumination substrate 2 described above, that is, a chain line A portion shown in FIG. In FIG. 4, an organic EL element is indicated by reference numeral 4 as a surface light emitting portion.

  As an example, the organic EL element 4 has a transparent electrode 5 made of ITO or the like as a solid electrode on the glass illumination substrate 2 described above, and an organic film 6 including a light emitting layer is further formed on the transparent electrode 5. At the same time, the counter electrode 7 is formed as a solid electrode on the organic film 6.

  The organic EL element composed of the transparent electrode 5, the organic film 6, and the counter electrode 7 is sealed on the back side by a sealing member 8 bonded to the transparent substrate 2. With the configuration described above, the light L generated in the organic film 6 passes through the transparent electrode 5 and the illumination substrate 2 and is projected toward the concave surface of the reflector 1.

  FIG. 5 shows another example of the laminated structure of the organic EL element described above. The organic EL element 4 shown in FIG. 5 shows a configuration example of multi-photon emission (MPE) in which a plurality of organic EL elements are superimposed with a conductive intermediate layer interposed therebetween. Note that the structure shown in FIG. 5 shows an example in which two light emitting layers are overlapped.

  That is, a transparent electrode 5 such as ITO is formed as a solid electrode on the glass illumination substrate 2 described above, and an organic film 6a including a light emitting layer is further formed on the transparent electrode 5, and on the organic film 6a. A light transmissive intermediate layer 9 is formed. Thereby, the first organic EL element is formed. An organic film 6b including a light emitting layer is formed on the intermediate layer 9, and a counter electrode 7 is formed thereon. The intermediate layer 9, the organic film 6b, and the counter electrode 7 form a second organic EL element.

  With the above laminated structure, two layers of organic EL elements are connected in series with the intermediate layer 9 in between, and a series stacked organic EL element having two light emitting layers can be obtained. With this configuration, the light L from the organic films 6 a and 6 b including the light emitting layer passes through the transparent electrode 5 and the illumination substrate 2 and is projected toward the concave surface of the reflector 1.

  According to the configuration shown in FIG. 5, the required constant luminance can be obtained with a small current density as compared with the single light emitting layer shown in FIG. Further, by combining the organic films 6a and 6b so that the emission colors of the organic films 6a and 6b are complementary to each other, it is possible to obtain almost white light that is ideal as illumination.

  For the above-mentioned organic EL element, an electric power supply line (not shown) is arranged along the above-described wires or chains 3a, 3b, 3c, and 3d for suspending the illumination board 2, thereby lighting the EL element. A drive current can be supplied.

  FIG. 6 shows a preferred example of the reflector 1 described above, that is, an enlarged cross-sectional view of the portion of the chain line B shown in FIG. In this embodiment, the reflecting plate 1 is made of wood, and a light-transmitting thin film 11 is laminated on the front surface (concave surface) of the wooden reflecting plate 1. The thin film 11 can be laminated by thermocompression bonding of a light transmissive resin. The thin film 11 can also be formed on the surface of the reflector 1 by painting.

  According to the reflecting plate 1 having the above-described configuration, it is possible to make use of the calm texture unique to trees including natural patterns such as annual rings, and to form a harmonious reflective lighting device for general home use. . In addition to this, the light-transmitting thin film 11 described above can improve the light reflection efficiency and contribute to preventing the reflector 1 from being soiled.

  Next, FIG. 7 shows an embodiment in which the lighting device according to the present invention is configured as a wall-mounted type, as viewed from the direction along the wall surface. The reflective illumination device shown in FIG. 7 has the same basic configuration as that of the illumination device already described with reference to FIGS. Description is omitted as appropriate.

  In the embodiment shown in FIG. 7, the reflector mounting portion 1 b formed in an L shape as shown in the figure is arranged so as to protrude from the center of the back surface of the reflector 1. On the other hand, a mounting adapter 13 is attached in advance to the wall surface 12 to which the lighting device is to be attached.

  And, by inserting the bent portion of the mounting portion 1b of the reflection plate formed in an L shape into the central space portion of the adapter 13 so as to face downward, and sliding the reflection plate 1 slightly downward, The lighting device can be attached to the wall surface 12 as shown in FIG.

  In the illuminating device shown in FIG. 7, for example, pipe-like stays having mechanical strength are used as the support means 3 a to 3 d of the illuminating substrate 1 interposed between the reflector 1 and the illuminating substrate 2. . Thereby, the illumination board | substrate 2 can be attached in the state facing the front center of the reflecting plate 1. FIG.

  In addition, by attaching the mounting adapter 13 described above to the ceiling surface, the lighting device can be detachably mounted as a ceiling direct mount type.

  According to the configuration described above, it is possible to provide a reflective illumination device that is excellent in decoration effect and can be reduced in size and weight, and thereby obtains an original effect described in the column of the effect of the invention described above. be able to.

  And the reflected light from a reflecting plate can be effectively permeate | transmitted by using a light-transmitting glass plate for example as an above-mentioned illumination board | substrate. In other words, since the form of the surface light emitting part formed on the illumination substrate can be viewed directly, not only the configuration including the four surface light emitting parts formed in a circle as shown in the embodiment, The number of units of the organic EL element as the surface light emitting part, the form of each unit, their arrangement pattern, the emission color of each unit are different, and further, the lighting of each unit is controlled independently By adding ingenuity, the decoration effect can be further increased.

  In the above-described embodiment, an example is shown in which a bottom emission type organic EL element in which light is projected to the reflecting plate 1 through the glass plate as the illumination substrate 2 is shown. Of course, the same effect as described above can be obtained even if a top emission type organic EL element in which light is directly projected on the reflecting plate 1 side without passing through the illumination substrate 2 is used.

  In the embodiment described above, a wooden reflector is used. However, the present invention is not limited to this, and a synthetic resin, a metal, or the like can also be used. Further, in the organic EL element as the surface light emitting portion formed on the illumination substrate, the above-described counter electrode and the sealing member are made of a light-transmitting material, or fine holes are formed in the counter electrode. Thus, an EL element capable of emitting light on both sides can be obtained. According to this, it is possible to realize an illuminating device in which direct light is added to light reflected by the reflecting plate.

It is the perspective view of the state which looked at 1st Embodiment of the reflection type illuminating device concerning this invention from diagonally downward. Similarly, it is the perspective view of the state which looked at 2nd Embodiment from diagonally downward. It is the side view of the state which looked at the illuminating device shown in FIG. 1 from the horizontal direction. It is sectional drawing which showed the laminated structural example of the organic EL element formed in an illumination board | substrate. It is sectional drawing which showed the other laminated structural example of the organic EL element. It is the fragmentary sectional view which showed the structural example of the reflecting plate. It is a side view which shows the example which employ | adopted the reflection type illuminating device concerning this invention as a wall surface attachment type | mold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reflector 2 Illumination board 3a-3d Support means 4a-4d Surface light emission part (organic EL element)
5 Transparent electrode 6, 6a, 6b Organic film 7 Counter electrode 8 Sealing member 9 Intermediate layer 11 Thin film 12 Wall surface 13 Mounting adapter

Claims (4)

A reflector having a suspended portion formed on the back surface, a flat illumination substrate having a surface light emitting portion that projects light toward the reflector, facing the front surface of the reflector, and the reflector A supporting means for supporting the illumination board so as to be opposed to the front surface of the reflector, interposed between the illumination board and the illumination board;
The reflector is flat and formed in a rectangular shape, and is curved in a bowl shape or a bowl shape so that the front side is concave, and the illumination substrate is formed in a rectangular shape and the surface light emitting unit Is composed of organic EL elements,
The support means is composed of four wires or chains suspended from four different points on the front surface of the reflector, and the lower ends of the wires or chains are connected to the corners of the illumination board, respectively. A reflection type illumination device, wherein an illumination substrate is supported in a suspended state directly below the reflection plate.   The reflective illumination device according to claim 1, wherein the organic EL element forming the surface light emitting unit is divided into a plurality of units on the illumination substrate.   The reflective illumination device according to claim 1, wherein the illumination substrate is made of a light transmissive material.   4. The reflective illumination according to claim 1, wherein the reflective plate is made of wood, and a light-transmitting thin film is formed on at least the front surface of the reflective plate. 5. apparatus.

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