JP2010182491A - Illuminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device in which, by arranging a large number of planar emitters as represented by an organic EL element in a specific morphology, interior design is brilliantly demonstrated and which can enhance the atmosphere of the space where illumination is installed. <P>SOLUTION: The illumination device 1 has a plurality of planar emitters 6 and irradiates light by luminescence of the planar emitters 6. Each of planar emitters 6 is arranged in a ring shape as one end part in length direction of each planar emitter 6 formed in rectangular shape constitutes an inner circumference fringe and the other end part in length direction of each planar emitter constitutes an outer circumference fringe, and a slope which expands in a shape of concentric circle from the inner circumference fringe to the outer circumference fringe is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device using a surface-emitting light source represented by, for example, an organic EL (electroluminescence) element.

  The organic EL element is driven by a low direct current voltage, has high luminous efficiency, can be reduced in weight and thickness, and has the property of hardly generating heat. Therefore, it is used for a flat panel display (FPD) in some portable devices and the like, and 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.

  The organic EL element can obtain R (red), G (green), B (blue) and other luminescent colors by selecting the material used for the EL luminescent layer. Or, by combining two or more kinds of emission colors, it becomes 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 and 2 and the like shown below utilize the above-described organic EL element and use it as a surface-emitting illumination device.

JP 2003-7450 A JP 2004-234868 A

  In the illuminating devices disclosed in Patent Documents 1 and 2, when an organic EL element is used as a surface light source, the main object is to prevent the occurrence of luminance unevenness. It is only the point which tries to utilize an element as a light source of a monotonous flat surface. For this reason, the lighting device is a monotonous device that lacks a particularly three-dimensional effect without accents, and does not bring out a gorgeous rendering effect or the like.

  The present invention has been made paying attention to the above-mentioned points, and by arranging a large number of surface light emitters typified by organic EL elements in a specific form, the interior property is brought out gorgeously and lighting is installed. It is an object of the present invention to provide a lighting device that can enhance the atmosphere of a space.

In order to solve the above-described problems, an illumination device according to the present invention is a lighting device that has a surface light emitting portion formed in a cylindrical shape and is irradiated with light by light emission from the surface light emitting portion. The upper end portion of the light emitting portion constitutes an inner peripheral edge, the lower end portion of the surface light emitting portion constitutes an outer peripheral edge, and has a gradient spreading concentrically from the inner peripheral edge toward the outer peripheral edge. Have
In this case, the surface light emitting portion is composed of a plurality of surface light emitters formed in a strip shape, and one end portion in the longitudinal direction of each surface light emitter constitutes the inner periphery, and the length of each surface light emitter is long. It is desirable that the surface light emitters are arranged in an annular shape so that the other end in the direction constitutes the outer peripheral edge. Further, it is desirable that the cylindrical surface light emitting portion is disposed in a state where the light emitting surface faces downward.
A cylindrical body having an upper end formed along the inner peripheral edge, a lower end formed along the outer peripheral edge, and a gradient in which a peripheral surface extends concentrically from the inner peripheral edge toward the outer peripheral edge. Preferably, the cylindrical body has translucency, and the surface light emitting portion is provided on the peripheral surface of the cylindrical body.
In addition, the said cylindrical body may be comprised by the some arc-shaped flat plate member formed with the elastic material being connected and curving. In that case, the transparent electrode of the surface emitting part can be formed on one surface of the flat plate member using the flat plate member as a transparent substrate.

According to the present invention, when the light emitting surface of the surface light emitting unit emits light, the light is emitted toward the lower center of the illumination device. That is, when the cylindrical surface light emitting unit is turned on, the light is condensed at the lower center of the lighting device, so that the light emission efficiency as the lighting means can be improved.
In addition, since the surface light emitting portion is cylindrical, there is no light emitting portion at the center of the lighting device, and the back side of the surface light emitter, that is, the outer peripheral side of the lighting device does not emit light, so The contrast is emphasized, the interior is brought out gorgeously, and the effect of improving the atmosphere of the space where the lighting is installed can be obtained.

FIG. 1 is a perspective view showing an overall configuration of an embodiment of a lighting device according to the present invention when applied to a ceiling hanging mold. FIG. 2 is a side view showing the overall configuration of an embodiment of the lighting device according to the present invention when applied to a ceiling hanging mold. FIG. 3 is a plan view (bottom view) showing the overall configuration of an embodiment of the lighting device according to the present invention when applied to a ceiling hanging mold. FIG. 4 is an enlarged cross-sectional view of a part of the embodiment of the illumination device according to the present invention. FIG. 5: is a top view of the flat member which comprises a cylindrical body about other embodiment of the illuminating device based on this invention. FIG. 6 is a perspective view showing an overall configuration of another embodiment of the lighting device according to the present invention when applied to a ceiling hanging mold.

Hereinafter, embodiments of the present invention will be described based on the embodiments shown in the drawings. 1 to 3 show an overall configuration of an embodiment of a lighting device according to the present invention when applied to a ceiling hanging type, FIG. 1 is a perspective view, FIG. 2 is a side view, FIG. 3 is a plan view (bottom view) looking up from below.
Below, the structure of each part which showed the same part with the same code | symbol is each demonstrated referring a code | symbol. In each of the drawings described below, in order to avoid complication, only each representative part is indicated by a reference symbol, and a part of the reference symbol is appropriately omitted depending on the drawing.

  The lighting device 1 according to the present invention is suspended by a plurality (three in this embodiment) of wires 4 as shown in the figure. The wire 4 is obtained by branching a cord 2 having one end attached to a ceiling surface (not shown) into three by a disk-like support member 3. All three wires 4 or any of the three wires 4 are formed by covering a conductive wire (not shown) for supplying a direct current rectified from a commercial power source with a predetermined insulating member, It functions as a power supply line to the lighting device 1.

The illuminating device 1 has a transparent cylindrical shape in which an upper end forms an annular inner peripheral edge, a lower end forms an annular outer peripheral edge, and a peripheral surface has a gradient that extends concentrically from the inner peripheral edge toward the outer peripheral edge. It has a body 5. The cylindrical body 5 is formed of a transparent and colorless material such as glass.
The tips of the three wires 4 are attached to the upper end portion of the cylindrical body 5 forming the annular inner peripheral edge at an equal arc interval, and the cylindrical body 5 is suspended while being suspended. It is made to be supported stably without doing.

  A plurality of organic EL modules 6 (surface light emitters), each of which is a light-emitting panel formed in a strip shape, are attached to the outer peripheral surface having a gradient of the cylindrical body 5 side by side. More specifically, one end portion (the upper end of the module) in the longitudinal direction of the strip-shaped organic EL module 6 constitutes the inner peripheral edge, and the other end portion (the lower end of the module) in the longitudinal direction of the organic EL module 6 constitutes the outer peripheral edge. Are arranged in a ring shape. That is, a plurality of organic EL modules 6 arranged in a ring form a cylindrical surface light emitting portion, and has a concentric gradient extending from the inner periphery to the outer periphery.

  At this time, as shown in a partially enlarged cross-sectional view of FIG. 4, the light emitting surface 6a of each organic EL module 6 is arranged so as to face the inner peripheral surface side of the cylindrical body 5 (that is, face downward). Since the body 5 has translucency, when the organic EL module 6 emits light, the light passes through the tubular body 5 and the lower part of the illumination device 1 is irradiated with light.

  As shown in FIG. 4, the organic EL module 6 has a transparent electrode 11 made of ITO or the like formed on a transparent substrate 10, and a hole transport layer 12, a light emitting functional layer 13 made of an organic material, and electron transport. A layer 14 and a metal back electrode 15 mainly composed of a material such as aluminum are sequentially formed, and the side surface and the back surface are covered with a casing 16 made of an insulating member. When the organic EL module 6 is attached to the cylindrical body 5, for example, as shown in FIG. 4, the lower end portion 16 a of the casing 16 is bonded to the cylindrical body 5, and the organic EL module 6 is attached to the cylindrical body 5. Is fixed.

From the upper end of the organic EL module 6, for example, an anode terminal line 17 electrically connected to the transparent electrode 11 is drawn out, and from the lower end of the organic EL module 6, it is electrically connected to the back electrode 15. The cathode terminal line 18 is drawn out.
On the other hand, on the outer peripheral surface of the cylindrical body 5, an anode line 20 made of copper wiring is printed on the upper end portion, and a cathode line 21 is printed on the lower end portion. The anode line 20 and the cathode line 21 are electrically connected to conductive lines (anode line and cathode line) in the wire 4, respectively.

The anode terminal line 17 drawn from the upper end of each organic EL module 6 arranged in plurality is electrically connected to the anode line 20 formed in the cylindrical body 5 and drawn from the lower end of each organic EL module 6. The cathode terminal line 18 is electrically connected to a cathode line 21 formed in the cylindrical body 5.
That is, each organic EL module 6 is supplied with power from the conductive wire in the wire 4 via the anode line 20 and the cathode line 21 of the cylindrical body 5 and emits light.

Here, at least the cathode line 21 formed in the cylindrical body 5 can be a common electrode for all the organic EL modules 6. On the other hand, regarding the anode line 20, it is good also as a common electrode with respect to all the organic EL modules 6, or you may comprise a common electrode per group by making the some organic EL module 6 into a group. Alternatively, the anode line 20 may be provided for each organic EL module 6.
However, in the case where the anode line 20 is provided for each module 6 or for each of a plurality of groups, a decoder means (not shown) for identifying each of the provided anode lines 20 in order to enable lighting control in that unit. It is desirable to provide
Moreover, as shown in FIG. 4, it is preferable that the anode line 20 and the cathode line 21 formed in the cylindrical body 5 are covered and protected by insulating members 22 and 23, respectively.

According to the illuminating device 1 configured as described above, when the light emitting surface of the organic EL module 6 provided in the cylindrical body 5 emits light, the light is emitted toward the lower center of the illuminating device 1. That is, when the plurality of organic EL modules 6 are simultaneously turned on, the light is condensed at the lower center of the lighting device 1, so that the light emission efficiency as the lighting means can be improved.
In addition, since the central portion of the tubular body 5 has no light emitting portion and the outer peripheral surface side of the transparent tubular body 5 does not emit light, the light contrast in the lighting device 1 is emphasized and the interior property is improved. Can be pulled out gorgeously, and the effect of enhancing the atmosphere of the space where the lighting is installed can be obtained.
Furthermore, it is possible to easily construct a configuration that performs lighting control in units of each organic EL module 6, and in that case, by controlling the lighting pattern of each organic EL module 6, more various effects can be obtained. be able to.

In the above-described embodiment, an example in which a plurality of organic EL modules 6 are arranged on the outer peripheral surface of the cylindrical body 5 has been described. However, the present invention is not limited thereto, and a plurality of surfaces are provided on the inner peripheral surface of the cylindrical body 5. A light emitting body (organic EL module 6) may be arranged to constitute a cylindrical surface light emitting section.
Further, the back electrode 15 of the organic EL module 6 described in the above embodiment is made of ITO or the like regardless of whether the surface on which the organic EL module 6 is disposed is the outer peripheral surface or the inner peripheral surface of the cylindrical body 5. The organic EL module 6 may be formed as a light emitting surface.

  Further, in the above-described embodiment, a plurality of strip-shaped surface light emitters (organic EL modules 6) are arranged on the peripheral surface of the cylindrical body 5, but one end constitutes the inner periphery and the other end is the outer periphery. If it comprises, the shape of a surface light-emitting body is not limited to strip shape, Other shapes (For example, a laterally long square, a parallelogram, etc.) may be sufficient. Or you may provide the strip | belt-shaped surface light emission part which covers the whole peripheral surface (inner peripheral surface or outer peripheral surface) with respect to the cylindrical body 5. FIG.

Furthermore, in the said embodiment, although the cylindrical body 5 which has translucency was used as the member integrally formed, and the organic EL module 6 was arrange | positioned along the outer peripheral surface, the illuminating device of this invention was shown. However, it is not limited to the form.
For example, as shown in FIG. 5A, an arc-shaped flat plate member 30 that becomes a donut-shaped disk when a predetermined number (for example, three) is connected is formed of an elastic material and has a light transmitting property. The predetermined number of sheets is formed by the substrate, and a plurality of strip-shaped surface light emitters 31 (organic EL surface light emitters) are arrayed directly on one surface thereof as shown in FIG. You may assemble to the cylindrical body 32 as shown. In addition, as a raw material of the said flexible substrate, the synthetic resin raw material which has elasticity is used, For example, a polyethylene terephthalate (PET), polyethersulfone (PES), etc. can be used suitably.

  When the flat plate member 30 is used as a transparent substrate and the surface light emitter 31 is formed directly on the surface thereof, first, a transparent electrode made of ITO or the like is formed on one surface of the flat plate member 30 by using, for example, a sputtering method. At this time, since a synthetic resin is used as the material of the flat plate member 30, the process temperature is limited due to the heat resistant temperature. For this reason, the transparent electrode may not be grown into sufficient crystallized ITO and may be in an amorphous ITO state.

  The amorphous ITO described above causes a problem of promoting the oxidation of an organic material functioning as a light emitting functional layer formed thereon, and thus a metal oxide semiconductor is formed as a buffer layer on the ITO film. It is desirable to film. As a material for forming the buffer layer, chromium oxide (CrOx), nickel oxide (NiOx), or the like can be used.

Then, the light emitting functional layer made of an organic material and the back electrode made of a metal material are sequentially formed on the buffer layer using means such as vapor deposition to form the surface light emitter 31 made of an organic EL element. it can. In this case, it is desirable that a film-like resin having gas barrier properties is further laminated on the entire flat plate member 30 so as to cover the surface light emitter 31 of the organic EL element. Thereby, the said light emission functional layer, a back electrode, etc. can be isolated from the water | moisture content, oxygen, etc. in air | atmosphere, and it can contribute to extending the lifetime of an organic EL element.
Desirably, a light emission driving current can be supplied to the surface light emitter 31 by inserting and arranging a pair of conductive wires for power feeding between the flat plate member 30 and the laminate resin.

In the example shown in FIG. 5, in the flat plate member 30, the plurality of surface light emitters 31 are provided on the surface that becomes the outer peripheral surface when the cylindrical body 32 is configured, but the inner peripheral surface is not limited thereto. The surface light emitter may be provided on the surface. In that case, by forming the back electrode with a transparent electrode made of ITO or the like, the inner peripheral surface side (the surface facing downward) of the cylindrical body 32 can emit light.
5B shows an example in which a plurality of strip-shaped surface light emitters 31 are arranged on the arc-shaped flat plate member 30. When the flat plate member 30 is assembled into the cylindrical body 32, one end is shown. Is the inner periphery and the other end is the outer periphery, the shape of the surface light emitter 31 is not limited to a strip shape, but may be other shapes (for example, a horizontally long rectangle or a parallelogram). Good. Or you may provide the strip | belt-shaped surface light emission part which covers the whole one surface (outer peripheral surface side or inner peripheral surface side) of the flat plate member 30. FIG.

  In all the embodiments, the organic EL module using an organic EL element as a surface light emitter has been described as an example. However, the present invention is not limited thereto, and an element such as an inorganic EL element can be used as long as it is an element capable of surface light emission. May be used.

DESCRIPTION OF SYMBOLS 1 Lighting apparatus 2 Code | symbol 3 Support member 4 Wire 5 Tubular body 6 Organic electroluminescent module (surface light-emitting body)
DESCRIPTION OF SYMBOLS 10 Transparent substrate 11 Transparent electrode 12 Hole transport layer 13 Light emission functional layer 14 Electron transport layer 15 Back electrode 16 Casing 17 Anode terminal line 18 Cathode terminal line 20 Anode line 21 Cathode line 22 Insulating member 23 Insulating member 30 Flat plate member 31 Surface light emission Body 32 Tubular body

Claims (7)

A lighting device having a surface light-emitting portion formed in a cylindrical shape and irradiated with light by light emission of the surface light-emitting portion,
The upper end portion of the surface light emitting portion constitutes an inner peripheral edge, the lower end portion of the surface light emitting portion constitutes an outer peripheral edge, and has a gradient extending concentrically from the inner peripheral edge toward the outer peripheral edge. A lighting device characterized by the above. The surface light emitting portion is composed of a plurality of surface light emitters formed in a strip shape,
The surface light emitters are arranged in an annular shape so that one end in the longitudinal direction of each surface light emitter constitutes the inner periphery and the other end in the longitudinal direction of each surface light emitter constitutes the outer periphery. The lighting device according to claim 1, wherein:   3. The lighting device according to claim 1, wherein the cylindrical surface light-emitting portion is disposed in a state in which the light-emitting surface faces downward. An upper end is formed along the inner peripheral edge, a lower end is formed along the outer peripheral edge, and a cylindrical body having a gradient in which a peripheral surface extends concentrically from the inner peripheral edge toward the outer peripheral edge,
The said cylindrical body has translucency, and the said surface emitting part is provided on the surrounding surface of the said cylindrical body, The illumination in any one of Claim 1 thru | or 3 characterized by the above-mentioned. apparatus.   The lighting device according to claim 4, wherein the cylindrical body is configured by connecting and bending a plurality of arc-shaped flat plate members formed of an elastic material.   The lighting device according to claim 5, wherein the flat plate member is used as a transparent substrate, and a transparent electrode of the surface light emitting unit is formed on one surface of the flat plate member.   The lighting device according to claim 1, wherein the surface light emitter is configured by an organic EL element.

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