JP4816604B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture.

Conventionally, light from a point light source such as a light emitting diode is emitted through a surface light source such as an organic EL element having translucency, so that the light from the point light source and the light from the surface light source are used in combination. There has been provided such a lighting fixture (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-8067

  Conventionally, when determining the luminance of a point light source, the luminance unevenness of the planar light source has not been considered.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can reduce a brightness nonuniformity.

  According to the first aspect of the present invention, there is provided a planar light source having a light emitting layer that emits light when energized in the thickness direction and a transparent electrode layer sandwiching the light emitting layer, and a light source that is translucent in the thickness direction. A first lighting unit to be turned on, a plurality of point light sources, a second lighting unit for lighting each point light source, and a window for emitting light from the point light source. And the second lighting part, respectively, and a container that holds the planar light source in such a manner that the window part is closed by the planar light source, and the second lighting part has a thickness direction of the planar light source. However, a point light source located at a position where the luminance of the planar light source is low as viewed from the outside of the window is turned on with higher luminance.

  According to this invention, since the uneven brightness of the planar light source is compensated by the point light source, the uneven brightness can be reduced as compared with the case where the point light source is not used.

  According to a second aspect of the present invention, in the first aspect of the invention, at least two of the point light sources are in the thickness direction of the planar light source, and the luminance of the planar light source is the same as viewed from the outside of the window portion. It is arrange | positioned in the position which becomes.

  According to the present invention, it is possible to make the luminance common to all point light sources in the thickness direction of the planar light source and at positions where the luminance of the planar light source is the same as viewed from the outside of the window. Therefore, compared with the case where the brightness | luminance of all the point light sources is varied, respectively, the structure of the 2nd lighting part can be simplified and manufacturing cost can be reduced.

  According to the first aspect of the present invention, a planar light source is turned on with a higher luminance as the point light source is located in the thickness direction of the planar light source and the luminance of the planar light source is lower when viewed from the outside of the window. Since the luminance unevenness of the light source is compensated by the point light source, the luminance unevenness can be reduced as compared with the case where the point light source is not used.

  According to the invention of claim 2, at least two of the point light sources are arranged at positions where the brightness of the surface light sources is the same as each other when viewed from the outside of the window portion in the thickness direction of the surface light source. Therefore, the luminance can be made common to all point light sources in the thickness direction of the planar light source and the luminance of the planar light source is the same as viewed from the outside of the window. Compared to the case where the brightness of all the point light sources is made different, the configuration of the second lighting part can be simplified and the manufacturing cost can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIG. 1, a planar light source 1, a printed wiring board 3 on which a plurality of point light sources 2 are mounted, a printed wiring board 3 and a planar light source 1 are accommodated. A held container 4. As the point light source 2, for example, a light emitting diode can be used. Hereinafter, the upper, lower, left and right will be described with reference to FIG.

  The planar light source 1 is a so-called organic EL element, and as shown in FIG. 2, a substrate 10 made of a transparent material and held in the container 4 with the thickness direction facing up and down, and translucency. A first electrode layer 11 made of a material having conductivity and provided on the upper surface of the substrate 10; a light emitting layer 12 provided on the first electrode layer 11 and emitting light when energized in the thickness direction; A second electrode layer 13 made of a material having translucency and conductivity, provided on the light-emitting layer 12 and sandwiching the light-emitting layer 12 between the first electrode layer 11 in the thickness direction; A sealing layer 14 made of a material and provided on the second electrode layer 13 and covering the light emitting layer 12 when viewed from above. As a material of the substrate 10, for example, glass can be used. Moreover, as a material of each electrode layer 11 and 13, for example, indium tin oxide (ITO) can be used, respectively. As a material of the sealing layer 14, for example, a silicone resin can be used. As described above, the substrate 10, the electrode layers 11 and 13, and the sealing layer 14 constituting the planar light source 1 have translucency, and the light emitting layer 12 is very thin. 1 has translucency in the vertical direction (thickness direction) as a whole.

  Further, the first electrode layer 11 is provided with a terminal portion 11a protruding leftward from the sealing layer 14 when viewed from above, and the second electrode layer 13 is disposed on the right side from the sealing layer 14 when viewed from above. A protruding terminal portion 13a is provided. Further, on the outer side in the left-right direction with respect to the terminal portions 11a and 13a, the connection terminals 15 made of a conductive material and the connection terminals 15 made of a conductive material and the terminal portions 11a and 13a are electrically connected in a one-to-one relationship. Conductive pattern 16 is provided. The connection terminal 15 and the conductive pattern 16 can be formed by plating, for example, chromium on the substrate 10. The printed wiring board 3 is mounted with circuit components (not shown) constituting a first lighting unit that generates DC power for lighting the planar light source 1, and the first lighting unit is connected to each connection terminal 15. For example, it is electrically connected via an electric wire (not shown). Since the first lighting unit can be realized by a known technique, illustration and detailed description thereof are omitted.

  The printed wiring board 3 is held in the container 4 with the surface on which each point light source 2 is mounted facing downward. A window hole 40 for emitting the light of each point light source 2 is opened on the lower surface of the container body 4, and the planar light source 1 is held by the container body 4 so as to close the window hole 40. Further, on the upper side of the planar light source 1 in the container 4, a diffuser plate 5 made of, for example, a translucent milky white plate that diffuses the light of each point light source 2 covers the upper surface of the planar light source 1. Is held in shape. That is, the light from each point light source 2 is emitted downward through the diffusion plate 5 and the planar light source 1, respectively. The printed wiring board 3 is mounted with circuit components (not shown) constituting a second lighting unit that generates DC power for lighting the point light source 2. Since the second lighting unit can be realized by a known technique, illustration and detailed description thereof are omitted.

  Here, in the planar light source 1, the current value of the current flowing in the light emitting layer 13 in the thickness direction due to the electrical resistance of the electrode layers 11 and 13 itself is the sum of the distances from the connection portions to the respective conductive patterns 16. A distribution corresponding to The luminance of the light emitting layer 13 depends on the current value. That is, uneven brightness similar to the current value distribution is generated in the planar light source 1.

  Therefore, in the present embodiment, the second lighting portion is viewed from the connection point (hereinafter referred to as “first connection point”) between the terminal portion 11a of the first electrode layer 11 and the conductive pattern 16 when viewed from below. And the point light source 2 having a larger sum of the distance from the connection point between the terminal portion 13a of the second electrode layer 13 and the conductive pattern 16 (hereinafter referred to as “second connection point”), that is, The point light source 2 in the position where the current value of the current flowing through the light emitting layer 13 in the thickness direction is small and the luminance of the planar light source 1 is low is turned on with high luminance by increasing the current value of the supplied current.

  According to the above configuration, the luminance unevenness of the planar light source 1 is reduced by the light of the point light source 2.

  In the above case, the set of points having the same luminance when viewed from below in the planar light source 1 has an elliptical shape with the first connection point and the second connection point as the focal points. A plurality of ellipses whose focal points are the first connection point and the second connection point are hypothesized, a plurality of point light sources 2 are provided on each ellipse, and the second lighting unit is a point light source on the same ellipse. 2 may belong to the same light source group, and power may be supplied for each light source group. That is, the second lighting unit supplies the same power to the plurality of point light sources 2 belonging to the same light source group to make the luminance uniform, and the point lighting sources 2 belonging to different light source groups are different from each other. Supply power to make the brightness different. According to this configuration, the manufacturing cost can be reduced by simplifying the circuit configuration of the second lighting unit for the number of the point light sources 2 as compared to supplying different power to all the point light sources 2. it can.

It is sectional drawing which shows embodiment of this invention. It is explanatory drawing which shows the structure of a planar light source same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar light source 2 Point light source 4 Container 11 1st electrode layer 12 Light emitting layer 13 2nd electrode layer

Claims (2)

A planar light source having a light-emitting layer that emits light when energized in the thickness direction and a transparent electrode layer sandwiching the light-emitting layer, and having translucency in the thickness direction;
A first lighting unit for lighting a planar light source;
A plurality of point light sources;
A second lighting unit for lighting each point light source;
It has a window part for emitting the light of the point light source, and stores the point light source, the first lighting part and the second lighting part, respectively, and the surface light source is closed by the surface light source. With a held body,
The second lighting unit is a lighting device characterized in that a point light source located at a position where the luminance of the planar light source is low in the thickness direction of the planar light source and viewed from the outside of the window unit is lit with higher luminance.   At least two of the point light sources are respectively arranged in the thickness direction of the surface light source and at positions where the luminance of the surface light source is the same as viewed from the outside of the window portion. Item 1. A lighting apparatus according to item 1.

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