JP4765612B2 - Lighting device - Google Patents

Description

  The present invention relates to an illuminating device, for example, an illuminating device using a planar light emitter by EL (Electro Luminescence).

Conventionally, an illuminating device using a planar light emitter such as an EL (Electro Luminescence) element as a light source has been proposed (see, for example, Patent Document 1).
A planar light emitting body using an EL element has a transparent electrode, a light emitting layer, and a metal electrode laminated on a glass substrate, and light generated in the light emitting layer by applying a voltage to the metal electrode and the transparent electrode is reflected on the glass substrate. It is emitted through. In an illuminating device using such a planar light emitter, a substantially entire area of the glass substrate is a light emitting region.
JP 2005-158369 A

By the way, in the illumination device using the EL element, the resistance value of the transparent electrode increases as the area increases, and therefore, darker dark areas tend to be easily generated in the corners and the peripheral part than the central part of the light emitting area. There is.
Such an illuminating device has a disadvantage in that the viewer may feel uneven brightness on the light emitting surface and the impression may deteriorate.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an illumination device that is difficult for a viewer to recognize as luminance unevenness even when luminance unevenness occurs on a light emitting surface.

  In order to achieve the above-described object, the present invention includes a planar light emitter in which a glass substrate and a light emitting layer are laminated, and the illumination device emits light from the light emitting layer from the glass substrate. It has a light-reducing layer provided on the surface of the substrate, and the light-reducing layer is provided corresponding to a dark area in the glass substrate.

In the illuminating device configured as described above, since the light reducing layer is provided on the glass substrate corresponding to the dark area in the peripheral portion of the glass substrate, the person who watches the light emitted through the glass substrate has the luminance of EL. It feels as if the brightness of the light emitting region is uniform without feeling unevenness.
And it can prevent that a peripheral part feels that the brightness | luminance is reduced intentionally and gives a bad impression. Here, the light-reducing layer is a part that decreases the luminance, and it is sufficient that the light-reducing layer as a whole is light-reduced from areas other than the dark area (central area) in the light-emitting area.
It should be noted that the light-reducing layer is not limited in the presence or absence of light transmissibility and color, and the light attenuation rate can be changed by providing a large number of circular or rectangular points, parallel lines, meshes, and the like.

  In the present invention, the light attenuation rate increases toward the peripheral portion of the light emitting surface.

  In the illuminating device configured as described above, since the dark part of the dark part of the peripheral part is not uniform, the light can be naturally reduced by increasing the light attenuation rate toward the peripheral part of the light emitting surface. it can.

According to the present invention, since the light reducing layer is provided on the glass substrate corresponding to the dark area in the peripheral portion of the glass substrate, a person watching the light emitted through the glass substrate does not feel uneven brightness of EL. It feels as if the brightness of the light emitting area is uniform.
Then, it is possible to obtain an effect that the peripheral portion feels that the luminance is intentionally lowered and it is possible to prevent giving a bad impression.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an example of use of the lighting device of the present invention, FIG. 2 is a perspective view showing a first embodiment according to the present invention, FIG. 3 is a sectional view of the lighting device, and FIG. FIG. 5A is a front view of the lighting device showing the arrangement of the light reducing layer, and FIG. 5B is a perspective view showing a light emission state of the lighting device.

(First embodiment)
As shown in FIG. 2, the lighting device 10 </ b> A according to the first embodiment of the present invention includes a planar light emitter 13 in which a glass substrate 11 and a light emitting layer 12 are laminated, and light from the light emitting layer 12 is emitted from the glass substrate 11. The light is emitted.
The glass substrate 11 has a light-reducing layer 14 provided on the surface, and the light-reducing layer 14 is provided corresponding to the dark part region 15 in the peripheral part of the glass substrate 11.

As shown in FIG. 3, the planar light emitter 13 uses an EL element, and is formed by laminating a glass substrate 11, a transparent electrode 16, a light emitting layer 12, and a metal electrode 17.
Accordingly, a voltage is applied to the transparent electrode 16 and the metal electrode 17 to cause the light emitting layer to emit light, and light is emitted through the glass substrate 11. The planar light-emitting body 13 is accommodated in a rectangular box-shaped frame 18 having an opening on one side, and the glass substrate 11 that is the light-emitting surface faces the opening side (upward in FIG. 3).
Thereby, the illuminating device 10A which emits light to the glass substrate 11 side is formed.

A light-reducing layer 14 is provided on the periphery of the glass substrate 11 constituting the light emitting surface in accordance with the dark area 15.
As shown in FIG. 4, the dimming layer 14 has transparency, and a large number of points 14a such as circles and polygons are formed on the surface of the glass substrate 11 by printing, painting, sticking a seal, and the like. Can do.
As a whole, the light-reducing layer 14 is dimmed more than the dark region 15 (central portion) in the light-emitting region.

  As shown in FIG. 4, the light attenuation rate in the light attenuation layer 14 can be adjusted by changing the ratio of the area of the point 14a and the area of the gap by changing the diameter of the point 14a. . In this case, the dimming rate can be increased by increasing the diameter toward the periphery.

Alternatively, although not shown, the diameter can be adjusted by changing the density of the points 14a while keeping the diameter of the points 14a constant. In this case, the light attenuation rate can be increased by disposing it closer to the periphery.
Further, the light attenuation rate can be adjusted by changing the color density of the point 14a. That is, gradation can be provided by increasing the color density toward the periphery.

Furthermore, since the light attenuation layer 14 is formed by painting or the like, the light attenuation rate is compared with the case where the light attenuation layer is formed by forming irregularities on the surface of the glass substrate 11 by mechanical means such as sandblasting. Is easy to adjust.
That is, in the case of sandblasting or the like, dust or the like accumulates on the irregularities formed on the surface of the glass substrate 11 and may become darker than necessary, or may become dirty and deteriorate appearance, etc. It is possible to avoid such inconvenience.

As shown in FIG. 5A, the dimming layer 14 is provided on the entire circumference of the rectangular glass substrate 11, and the dimming rate increases toward the circumference. The light reducing layer 14 is not provided in the center.
For this reason, it becomes darker as it goes from the center to the periphery, and it is possible to obscure the boundary that clearly appears as a clear contrast between the frame 18 and the light emitting surface. By increasing the attenuation rate of the region 15 (peripheral portion), it can be reduced in a natural manner.

  FIG. 1 shows a usage example of the lighting device 10A described above. For example, it can be provided in a public outdoor space such as a pedestrian (pedestrian / bicycle road) provided in a school district or a pedestrian bridge or a pedestrian deck often provided in front of a station in recent years.

For example, the lighting devices 10A in the right column (lower side in FIG. 1) are directed rightward (rightward in FIG. 1). The lighting device 10 </ b> A in the left column can blink to the left, thereby guiding a pedestrian.
Or it can use for the production | presentation which considered the external appearance by arrange | positioning in a predetermined shape in a square and making it light appropriately. As illustrated in FIG. 3, the lighting device 10 </ b> A is embedded in pavement or the like while being accommodated in the frame 18.

  As described above, in the illumination device 10A described above, the light reducing layer 14 is provided on the glass substrate 11 corresponding to the peripheral portion which is the dark region 15 in the glass substrate 11, so that the light emitted through the glass substrate 11 is viewed. The person feels that the brightness is intentionally reduced in the peripheral part without feeling the brightness unevenness of the EL. That is, it is possible to prevent giving a bad impression.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 6 shows a second embodiment of a lighting device according to the present invention.
In addition, the same code | symbol is attached | subjected to the site | part which is common in 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

As shown in FIG. 6, in this illuminating device 10B, the light reduction layer 14 is provided in the surrounding part of the glass substrate 11 which comprises a light emission surface. The light-reducing layer 14 has transparency, and a large number of parallel lines 14b are formed on the surface of the glass substrate 11 by printing, painting, sticking a seal, or the like.
As a whole, the light-reducing layer 14 is dimmed more than the dark region 15 (central portion) in the light-emitting region.

As shown in FIG. 6, the light attenuation rate in the light reducing layer 14 is obtained by changing the inter-column dimension while keeping the line width of the parallel line 14 b constant, and the area of the gap between the parallel lines 14 b. It can be adjusted by changing the ratio.
In this case, the distance between the rows is reduced toward the periphery, thereby increasing the light attenuation rate.

Or although not shown in figure, it can adjust by changing the density of the parallel line 14b, making the dimension between the lines of the parallel line 14b constant.
In this case, a parallel line 14b having a thicker line width is disposed toward the periphery to increase the light attenuation rate.

Further, the light attenuation rate can be adjusted by changing the color density of the parallel lines 14b. That is, gradation can be provided by increasing the color density of the parallel lines 14b toward the periphery.
Thereby, the same operation and effect as in the case of the first embodiment described above can be obtained.

(Third embodiment)
Next, a third embodiment will be described. FIG. 7 shows a third embodiment of a lighting device according to the present invention.
In addition, the same code | symbol is attached | subjected to the site | part which is common in 1st Embodiment or 2nd Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 7, in this illuminating device 10C, the light reduction layer 14 is provided in the peripheral part of the glass substrate 11 which comprises a light emission surface. The light reducing layer 14 has transparency and is formed by providing a mesh 14 c on the surface of the glass substrate 11. As a whole, the light-reducing layer 14 is lightened more than the light-emitting region other than the dark region 15.

The dimming rate in the dimming layer 14 can be adjusted by changing the mesh 14c forming the dimming layer 14.
That is, adjustment is performed by changing the size of the mesh 14c, the thickness of the line forming the mesh 14c, and the like. In this case, the gradation can be provided by decreasing the interval between the meshes 14c as it goes to the periphery, or by increasing the line forming the mesh 14c as it goes to the periphery.
Thereby, the same operation and effect as the case of the first embodiment or the second embodiment described above can be obtained.

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 8 shows a fourth embodiment of a lighting device according to the present invention.
In addition, the same code | symbol is attached | subjected to the site | part which is common in any one of 3rd Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

As shown in FIG. 8, in this illuminating device 10D, the light reduction layer 14 is provided in the surrounding part of the glass substrate 11 which comprises a light emission surface. The light reducing layer 14 has transparency, and is formed by providing a solid coating portion 14 d on the surface of the glass substrate 11.
As a whole, the light-reducing layer 14 is lightened more than the light-emitting region other than the dark region 15.

The light reduction rate in the light reduction layer 14 can be adjusted by changing the transmittance of the solid coating portion 14d by changing the solid coating portion 14d forming the light reduction layer 14.
In this case, the density of the solid coating portion 14d is increased toward the periphery.

Alternatively, a gradation can be provided by using a paint or ink having a lower permeability toward the periphery.
Thereby, the same operation and effect as the case of the first embodiment or the second embodiment described above can be obtained.

In addition, the illuminating device of this invention is not limited to each embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
For example, in each of the above-described embodiments, the case where the light reduction layer 14 is provided as the peripheral portion over the entire circumference of the glass substrate 11 is exemplified. It is also possible to provide the light reducing layer 14 only on the two opposing sides.
Alternatively, as shown in FIG. 10, the light reducing layers 14 can be provided only at the four corners.

  As described above, since the illumination device according to the present invention has the light reducing layer provided on the glass substrate corresponding to the dark area in the peripheral portion of the glass substrate, the person who watches the light emitted through the glass substrate is EL. It feels as if the luminance of the light emitting region is uniform without feeling the luminance unevenness. The peripheral portion feels that the luminance is intentionally lowered and has an effect of preventing giving a bad impression. For example, the peripheral portion is useful as a lighting device using a planar light emitter by EL. is there.

It is a perspective view which shows the usage example of the illuminating device of this invention. 1 is a perspective view showing a first embodiment according to the present invention. It is sectional drawing of the illuminating device which concerns on this invention. It is an enlarged plan view which shows the light reduction layer in the illuminating device which concerns on this invention. (A) is a front view of the illuminating device which shows arrangement | positioning of a light attenuation layer. (B) is a perspective view which shows the light emission state of an illuminating device. It is a perspective view which shows 2nd Embodiment which concerns on this invention. It is a perspective view which shows 3rd Embodiment based on this invention. It is a perspective view which shows 4th Embodiment which concerns on this invention. (A) is a front view of the illuminating device which shows another arrangement | positioning of a light attenuation layer. (B) is a perspective view which shows the light emission state of the illuminating device of (A). (A) is a front view of the illuminating device which shows another arrangement | positioning of a light attenuation layer. (B) is a perspective view which shows the light emission state of the illuminating device of (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Illuminating device 11 Glass substrate 12 Light emitting layer 13 Planar light-emitting body 14 Light attenuation layer

Claims (1)

Provided with a planar light emitting body on which a metal electrode, a light emitting layer, a transparent electrode, and a glass substrate are laminated,
An illumination device in which light of the light emitting layer is emitted from the glass substrate,
A light-reducing layer provided corresponding to a dark area on the surface of the glass substrate;
The illuminating device in which the dimming rate increases as the dimming layer moves from the center to the periphery along the surface of the glass substrate.

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