JP5105534B2 - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device having a high flexibility as rendering lighting, and easily attachable. <P>SOLUTION: The lighting device includes a plurality of long planar light emitting elements arranged at predetermined intervals, and a power feed part holding one-side ends of the long planar light emitting elements, and feeding power thereto, and is structured such that the power feed part can be bent. The power feed part can be bent according to this structure, and the long planar light emitting elements are displaced in response to the shape of the power feed part, so that a curved surface shape by the aggregate of the long planar light emitting elements can be provided without forming each long planar light emitting element into a complicated shape. Even if the long planar light emitting element does not particularly have flexibility, the curved shape can be provided by using the aggregate of the multiple long planar light emitting elements. Accordingly, the lighting device high in strength and reliability can be provided. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a lighting device, and more particularly to a lighting device that is natural and excellent in performance.

In recent years, electroluminescence elements such as organic electroluminescence (EL) elements have attracted attention as planar light-emitting illumination devices. An electroluminescent element emits light when a voltage is applied to a fluorescent material, and can be classified into an organic electroluminescent element and an inorganic electroluminescent element depending on the fluorescent material used. In particular, the organic electroluminescence element can easily emit light on a plane, can emit light with a high luminance of about 100 to 100,000 cd / m ² at a low voltage of about 10 V such as a battery, and the combination of materials constituting the fluorescent substance. Since it can emit a large number of colors, it attracts attention as a flat light emitter.

  The conventional planar light-emitting illuminating device does not bend, is linear, has an artificial image, and has a low degree of freedom in space production. In addition, it usually emits light on a flat surface, and there are restrictions on the installation location.

In order to overcome such restrictions on installation location, a rectangular conductor for power feeding is arranged in parallel, and this is covered with an insulating film to form a flat cable, and a strip-shaped EL element is adhered to the flat cable. There has been proposed an EL indicator lamp in which a lamp case is inserted into a flexible case (Patent Document 1).
There has also been proposed a planar lighting device in which an electroluminescent element is formed on a flexible substrate, provided inside a portable storage device such as a wallet (Patent Document 2).

JP-A-6-290869 JP 2005-95309 A

However, although the EL display lamp of Patent Document 1 has a degree of freedom in mounting, it is a flat panel and cannot exceed the range of artificial lighting, and there has been a demand for illumination with excellent performance.
Moreover, although the illuminating device of patent document 2 is a thin and flexible illuminating device, it was for the internal illumination of a portable storage tool, and although there was an illumination function, it was not able to expect directivity.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an illumination device that has a high degree of freedom and is easy to attach as effect lighting.

A planar light-emitting illuminating device according to the present invention includes a plurality of long planar light emitting elements arranged at predetermined intervals, and a power feeding unit that holds one end of the long planar light emitting elements and supplies power The elongated planar light emitting element is connected to the longitudinal direction of the elongated planar light emitting element via a connection portion including a power line in the longitudinal direction of the elongated planar light emitting element. Has a divided structure in which the power supply contact portions provided in the case are connected to each other via a connection portion formed by covering a conductive wire with a flexible resin .
According to this configuration, the power feeding unit can be bent, and the long planar light emitting element is displaced along with the shape of the power feeding unit. Therefore, the planar light emitting element is elongated without having a complicated shape. It is possible to realize a curved surface shape by a set of planar light emitting elements. In particular, even if the long planar light emitting element is not flexible, a curved surface shape can be realized by using an assembly of many long planar light emitting elements. Accordingly, the strength is high and the reliability is high.

The planar light-emitting illuminating device of the present invention is the above-described illumination device, wherein the elongated planar light-emitting element is suspended with one end connected to and supported by the power feeding unit, and the other end is free. Includes what constitutes an end.
According to this configuration, the power feeding unit can be bent, and the long planar light emitting element is suspended from the power feeding unit. Therefore, the power feeding unit is displaced with the shape of the power feeding unit, and from the light emitting surface of the planar light emitting element. Since it fluctuates due to air convection due to heat generation, light fluctuations may be generated, and it is possible to produce highly sophisticated lighting with a wide variety of changes. In addition, since the long planar light emitting elements composed of a plurality of flexible strips are arranged at a predetermined interval, various fluctuations can be generated by changes in individual strips. it can.

Moreover, the planar light-emitting illuminating device of this invention contains the said elongate planar light emitting element from which the position of a lower end differs.
This configuration improves performance.

In the planar light-emitting illuminating device of the present invention, the long planar light-emitting elements include those whose length gradually changes in the arrangement order.
With this configuration, even if a shake occurs, the effect is improved because the shake continuously.

In the planar light-emitting illuminating device of the present invention, the elongated planar light-emitting element includes one in which both ends are connected to and supported by the power feeding unit.
According to this configuration, it is possible to efficiently provide power from both ends, and to achieve highly reliable production lighting with high supportability.

In the planar light-emitting lighting device of the present invention, the power feeding part is configured by a wiring part for power feeding and a support piece part that supports the wiring part, and the support piece part has flexibility. including.
According to this configuration, it is possible to realize illumination with better bending characteristics.

In the planar light-emitting illuminating device of the present invention, the long planar light-emitting elements include those having the same width and arranged at equal intervals.
According to this configuration, when the power supply unit is bent, when the power supply unit is bent following the power supply unit, the light is bent between the long planar light emitting elements. It becomes possible to obtain a different shape.

In the planar light-emitting illuminating device of the present invention, the elongated planar light-emitting element is formed by connecting a plurality of strip-shaped planar light-emitting elements in the longitudinal direction of the element. The long surface light emitting elements whose positions are adjacent to each other are included.
According to this configuration, it is possible to provide performance even by a change in the connecting portion in the longitudinal direction.

In the planar light-emitting illuminating device of the present invention, the elongated planar light-emitting element includes one in which the position of the connection portion gradually changes in the arrangement order.
According to this structure, since the connection part of a longitudinal direction is changing continuously, stage performance improves more.

In the planar light-emitting illuminating device of the present invention, the long planar light emitting element rotates with respect to a central axis in a longitudinal direction of the long planar light emitting element with respect to the power feeding portion. Including those that are movable.
According to this configuration, it is possible to change not only the vertical direction but also the direction of each elongated planar light emitting element, and the performance is further improved.

  As described above, according to the lighting device of the present invention, the power feeding part can be bent, and the long planar light emitting element is displaced with the shape of the power feeding part. It is possible to realize a curved surface shape by a set of long planar light emitting elements without using a shape. Therefore, it is possible to provide a lighting device that has a high degree of freedom and can be easily mounted as effect lighting.

Hereinafter, a lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings . First, a reference example will be described.
(Reference Example 1)
As shown in FIGS. 1 to 3, the lighting device holds a plurality of long planar light emitting elements 1 arranged at a predetermined interval and one end of the long planar light emitting elements 1. And a power feeding unit 2 that feeds power, and the power feeding unit 2 is configured to be bendable.
Here, FIG. 1 is a perspective view of the illumination device, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a diagram showing an organic electroluminescent element used in the illumination device.
As shown in FIG. 2, the illumination device has element elements 101 a, 101 b, 102 a, 102 b... Of strip-like organic electroluminescent elements connected in the longitudinal direction via power lines 12 .
As shown in FIGS. 3 (a) and 3 (b), the element elements constituting the organic electroluminescent element have an anode 11 made of a transparent conductive film on the surface of a light-transmitting glass substrate 10, and a light emitting function. The layer 12 and the cathode 13 are sequentially laminated, and the outside is covered with a glass case 14.

  Each of the long planar light emitting elements 1 is an organic electroluminescent element composed of two element elements 101a, 101b, 102a, 102b, which are connected to each other via a connecting portion 110 including electric power 12. Each of the long planar light emitting elements is configured such that the position of the connecting portion is different.

According to this configuration, the power feeding unit 2 can be bent, and the long planar light emitting element 1 is displaced with the shape of the power feeding unit 2. For this reason, the angle formed by the light emitting surface can be changed without making the planar light emitting element 1 in a complicated shape, and a curved surface shape can be realized by the assembly of the long planar light emitting elements 1. It becomes possible. In particular, the long planar light emitting device 1 is a rigid substrate formed on a glass substrate, and an assembly of a number of long planar light emitting devices 1 even if they are not flexible. The curved surface shape can be realized by using. Accordingly, the strength is high and the reliability is high.
Furthermore, since it is connected via the connection part also in the longitudinal direction, the degree of freedom is higher and the performance is improved. Moreover, the length of the connection part is comprised so that expansion-contraction is possible.

In the reference example 1 , the position of the lower end is aligned, but the position of the lower end may be different for each adjacent long planar light emitting element. This configuration further improves performance.

(Reference Example 2)
Next, Reference Example 2 will be described.
In the illuminating device of Reference Example 1 , the longitudinal connection portions 110 of the organic electroluminescent elements constituting the respective long planar light emitting elements are configured to be different in the adjacent long planar light emitting elements. However, the reference example 2 is characterized in that, as shown in the perspective view of FIG. 4, the connecting portions are sequentially positioned downward from left to right.

In the planar light-emitting illuminating device of Reference Example 2, the long planar light-emitting elements include those whose length gradually changes in the arrangement order.
With this configuration, even if a shake occurs, the effect is improved because the shake continuously.

(Embodiment 1 )
Next, Embodiment 1 of the present invention will be described.
In the illumination device of Reference Example 1, the longitudinal connection portions 110 of the organic electroluminescent elements constituting the long planar light emitting elements are different in the adjacent long planar light emitting elements. In this embodiment, as shown in the perspective view of FIG. 5 and the BB cross-sectional view of FIG. 5 in FIG. 6, each element element has the same length, and the connection portion has the same height. Each of the long planar light emitting elements is configured to be rotatable with respect to the power feeding unit 2.

  The power supply section 2 includes a power supply contact section 202 provided on an inner wall of a recess provided in a resin case 201 and the power supply contact section 202, and is a connection formed by covering a conductive wire with a flexible resin. The power supply unit 2 itself has a divided structure and is configured so that a curved shape can be easily obtained.

  Each of the long planar light emitting elements includes a support portion 120 having a spherical power supply region at the upper end, and is configured to be rotatable while maintaining electrical connection in the power supply contact portion 202. Here, it is assumed that the + -wiring is configured so that power can be supplied to the long planar light emitting element by using two striped conductors.

  As described above, in the illumination device according to the present embodiment, the long planar light emitting element is in relation to the central axis in the longitudinal direction of the long planar light emitting element with respect to the feeding portion. Since it can be rotated, not only the vertical direction but also the direction of each elongated planar light emitting element can be changed, and the performance is further improved.

(Embodiment 2 )
Next will be described a second embodiment of the present invention.
In the illumination devices of Reference Examples 1 and 2 and Embodiment 1, only one end of each elongated planar light emitting element 1 is supported. In the present embodiment, as shown in FIG. The power supply units 2 and 3 are provided at both ends, respectively. Since the other parts are configured in the same manner as in Reference Example 1 , description thereof is omitted here.
It is desirable that both of the power feeding units 2 and 3 are pivotable connecting units as shown in FIG. 6 in the description of the first embodiment. Thereby, it is also possible to arrange the long planar light emitting elements so as to be twisted in the vertical direction.
According to this configuration, it is possible to efficiently provide power from both ends, and to achieve highly reliable production lighting with high supportability.

  Further, the power feeding part is constituted by a power feeding wiring part and a support piece part that supports the wiring part, and the support piece part is configured to have flexibility, thereby being more excellent in bending characteristics. Can be realized.

The long planar light emitting elements have the same width and are arranged at equal intervals.
According to this configuration, when the power supply unit is bent, when the power supply unit is bent following the power supply unit, the light is bent between the long planar light emitting elements. It becomes possible to obtain a different shape.

  Also in this embodiment, the long planar light emitting element is configured by connecting a plurality of strip-shaped planar light emitting elements in the longitudinal direction of the element, and the position of the connection portion is adjacent. By making the surface light emitting elements different in scale, it is possible to enhance the rendering performance even by changing the connecting portion in the longitudinal direction.

  Also in the present embodiment, the long planar light emitting element is configured such that the position of the connecting portion gradually changes in the arrangement order, so that the connecting portion in the longitudinal direction changes continuously. The performance is further improved.

  In addition, the long planar light emitting element can be rotated with respect to the power supply portion with respect to the central axis in the longitudinal direction of the long planar light emitting element. Further, the direction of each elongated planar light emitting element can be changed, and the performance is further improved.

Next, an example of the organic electroluminescent element constituting the long planar light emitting element used in the lighting device of the present invention described above will be described.
Here, as the translucent substrate 10 constituting each element of the organic electroluminescent element, a translucent glass plate such as soda lime glass or non-alkali glass, a translucent plastic plate, or the like is used. it can. The light-transmitting substrate 10 may be light-transmitting and may be colorless or transparent, slightly colored, or ground glass.

  The layer 12 having a light emitting function is a multilayer film in which, in addition to a so-called light emitting layer, a hole transport layer is laminated on the anode 11 side and an electron injection layer is laminated on the cathode 13 side, a positive voltage is applied to the anode 11, and the cathode 13. When a negative voltage is applied to the electrons, electrons injected through the electron injection layer and holes injected through the hole transport layer are combined in the light emitting layer to emit light. The light emitted from the layer 12 having a light emitting function in this manner is transmitted through the anode 11 made of a transparent conductive film and the translucent substrate 10 and extracted from the surface side of the translucent substrate 10. The organic electroluminescence element 1 can emit light with high luminance at a low voltage of about 10 V such as a battery.

The anode 11 is an electrode for injecting holes into the layer having a light emitting function, and it is preferable to use an electrode material made of a metal, an alloy, a conductive compound, or a mixture thereof having a large work function. Is preferably 4 eV or more. Examples of the material of the anode 2 include Au (gold) metal, CuI (copper iodide), ITO (indium tin oxide: indium tin oxide), SnO ₂ (tin oxide), ZnO (zinc oxide), and the like. The translucent conductive material can be used. The anode 11 is formed, for example, by depositing and patterning these electrode materials on the surface of the translucent substrate 10 by a method such as a vacuum deposition method or a sputtering method. In order to transmit light emitted from the layer 12 having a light emitting function through the anode 11 and radiate the light to the outside, the light transmittance of the anode 11 is preferably set to 70% or more. Furthermore, the sheet resistance of the anode 11 is preferably several hundred Ω / □ or less, and particularly preferably 100 Ω / □ or less. Here, the film thickness of the anode 11 varies depending on the material in order to control the characteristics such as light transmittance and sheet resistance of the anode 11 as described above, but is set to 500 nm or less, preferably 10 to 200 nm. Is desirable.

The cathode 13 is an electrode for injecting electrons into the layer 12 having a light emitting function, and an electrode material made of a metal, an alloy, a conductive compound, or a mixture thereof having a small work function is preferably used. The function is preferably 5 eV or less. Examples of the electrode material of the cathode 13 include sodium, sodium-potassium alloy, lithium, magnesium, aluminum, magnesium-silver mixture, magnesium-indium mixture, aluminum-lithium alloy, Al / Al ₂ O ₃ mixture, Al / LiF mixture and the like. Similarly to the anode, the cathode 13 can be obtained by, for example, patterning these electrode materials after film formation by a method such as a vacuum evaporation method or a sputtering method. In order to irradiate the anode 11 side with light emitted from the layer 12 having a light emitting function, the light transmittance of the cathode 13 is preferably 10% or less. Here, the film thickness of the cathode 13 varies depending on the material, but is usually 500 nm or less, preferably in the range of 100 to 200 nm in order to control characteristics such as light transmittance of the cathode 13.

  Here, of the layer 12 having a light emitting function, a light emitting material or a doping material used for a light emitting layer sandwiched between an electron transport layer and a hole transport layer is anthracene, naphthalene, pyrene, tetracene, coronene, perylene, phthaloperylene, naphthaloperylene, Diphenylbutadiene, tetraphenylbutadiene, coumarin, oxadiazole, bisbenzoxazoline, bisstyryl, cyclopentadiene, quinoline metal complex, tris (8-hydroxyquinolinato) aluminum complex, tris (4-methyl-8-quinolinato) aluminum Complexes, tris (5-phenyl-8-quinolinato) aluminum complexes, aminoquinoline metal complexes, benzoquinoline metal complexes, tri- (p-terphenyl-4-yl) amine, 1-aryl-2,5-di (2 -Thienyl) Examples include, but are not limited to, pyrrole derivatives, pyran, quinacridone, rubrene, distilbenzene derivatives, distilarylene derivatives, and various fluorescent dyes.

  The layer 12 having a light emitting function has a hole transport layer laminated between the light emitting layer and the anode 11, that is, on the anode side, and the material constituting the hole transport layer has the ability to transport holes. A compound that has a hole injection effect from the anode 11, an excellent hole injection effect for the light emitting layer, prevents movement of electrons to the hole transport layer, and has an excellent thin film forming ability. Can be mentioned. Specifically, phthalocyanine derivatives, naphthalocyanine derivatives, porphyrin derivatives, N, N′-bis (3-methylphenyl)-(1,1′-biphenyl) -4,4′-diamine (TPD) and 4,4 Aromatic diamine compounds such as' -bis [N- (naphthyl) -N-phenyl-amino] biphenyl (α-NPD), oxazole, oxadiazole, triazole, imidazole, imidazolone, stilbene derivative, pyrazoline derivative, tetrahydroimidazole, Polyarylalkanes, butadiene, 4,4 ′, 4 ″ -tris (N- (3-methylphenyl) N-phenylamino) triphenylamine (m-MTDATA), and polyvinyl carbazole, polysilane, polyethylene dioxide thiophene (PEDOT) ) And other conductive polymers Molecular material and the like.

The layer 12 having a light emitting function includes an electron injecting layer laminated between the light emitting layer and the cathode 13, that is, on the cathode 13 side, and a material constituting the electron injecting layer is an ability to transport electrons. And has an electron injection effect from the cathode 13 and an excellent electron injection effect for the layer 12 having a light emitting function, and further prevents movement of holes to the electron injection layer, and a thin film forming ability. Can be mentioned. Specifically, fluorene, bathophenanthroline, bathocuproine, anthraquinodimethane, diphenoquinone, oxazole, oxadiazole, triazole, imidazole, anthraquinodimethane, etc. and their compounds, metal complex compounds or nitrogen-containing five-membered ring derivatives is there. Furthermore, the polymer material used for a polymer organic electroluminescent element can also be used. For example, polyparaphenylene and derivatives thereof, fluorene and derivatives thereof, and the like. The electron injection layer can be formed, for example, by co-evaporating bathophenanthroline and Cs (cesium) at a molar ratio of 1: 1.
In the reference example and the embodiment, the organic electroluminescent element is formed on a glass substrate, but a flexible substrate formed on a flexible film may be used.
In the reference example and the embodiment described above, an example in which an organic electroluminescence element is used as a planar light emitting element has been described. You may do it.

  As described above, according to the present invention, since it is possible to realize a rounded and soft lighting, it can be applied in a wide range from home lighting to offices and showrooms.

The perspective view which shows the illuminating device of the reference example 1. Cross-sectional explanatory drawing of the main part showing the illumination device of Reference Example 1. Explanatory drawing which shows the structure of the organic electroluminescent element used with the planar light emission type illuminating device of a reference example and embodiment of this invention The perspective view which shows the illuminating device of the reference example 2. The perspective view which shows the illuminating device of Embodiment 1 of this invention. Cross-sectional explanatory drawing of the main part showing the illumination device according to Embodiment 1 of the present invention. The perspective view which shows the illuminating device of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar light emitting element 2 Feeding part 3 Feeding part

Claims (6)

A plurality of elongated planar light emitting elements arranged at predetermined intervals;
A power feeding unit that holds one end of the long planar light emitting element and feeds power; and
The elongated planar light emitting element is connected to a longitudinal direction of the elongated planar light emitting element via a connection portion including a plurality of light emitting element elements including power lines,
The power supply unit is a lighting device having a divided structure in which power supply contact parts provided in a case are connected to each other via a connection part formed by covering a conductive wire with a flexible resin .   The lighting device according to claim 1,
  A lighting device in which the plurality of light emitting element elements have different lengths. The lighting device according to claim 1 or 2 ,
The long planar light emitting element has one end connected to and supported by the power supply unit and is suspended, and the other end is a lighting device constituting a free end. The lighting device according to claim 1 or 2 ,
The long planar light emitting element is an illumination device in which both ends are connected to and supported by the power feeding unit. A lighting device according to any one of claims 1 to 4,
The power feeding unit includes a power feeding wiring part and a supporting piece part that supports the wiring part, and the supporting piece part is a lighting device having flexibility. A lighting device according to any one of claims 1 to 5,
The illuminating device, wherein the long planar light emitting element is rotatable with respect to the central axis in the longitudinal direction of the long planar light emitting element with respect to the power feeding unit.

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