JP2006216519A - Light emitting panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting panel capable of achieving the reduction of power consumption, elongation of life, improvement of light distribution characteristics, and reduction of a thickness of the panel. <P>SOLUTION: In this electroluminescent fiber, a luminous body including rare earth elements as an activator in alkaline earth metal aluminate is coated in the form of a layer between a tube-like core electrode in a center part and a spiral additional electrode in an outer periphery. The electroluminescent fiber 6 is inserted into a groove of a transparent plate 7 such as acryl and is arranged in a reciprocatedly meandering form or a spiral form so that the plate exhibits almost uniform illuminance. LED 9 and a light guide plate 8 are alternately arranged in equal intervals on an end surface of the transparent plate as an auxiliary light source, and one light emitting panel is obtained. The light emitting panels are stacked in the multi-layer form, the emission illuminance is uniformed, and alternately arranged in vertical and lateral directions, and a bright light emitting panel group is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a light emitting panel for use in illuminated signs, indicator lamps, and the like.

Currently used signboards and indicator lamps with internal lighting use fluorescent lamps (fluorescent lamps) as the light source for illumination. However, due to the high power consumption and short lamp life, Maintenance costs are required. Fluorescent lamps have a lifetime of only about 2 years, but are inexpensive, so there is no more practical use. The disadvantage of this fluorescent lamp is that the lamp has a rod-like shape, so the light distribution characteristic is bad, and the distance D between the lamp and the signboard surface must be long as shown in FIG.
In the example of a signboard as shown in FIG. 8, in order to make the surface illuminance uniform, 3 to 4 30W fluorescent lamps are used, the amount of power used is 90 to 120W × lighting time, and the lamp is attached to the signboard bottom plate. The distance D between the fluorescent lamp and the signboard surface needs to be 250 mm or more. The reason is that at distances D less than that, the intensity of the light from the lamp appears on the surface and the light spots on the signboard become large, causing problems in use. In recent years, there are many light emitting panels such as display boards using LEDs, but the use of many LEDs makes it very expensive. Since light-emitting panels using fluorescent lamps consume a lot of commercial power, there are some factors that will eventually become problematic as environmental measures.

As described above, currently used light-emitting panels such as signboards and indicator lamps with internal lighting generally use fluorescent lamps, so they consume a lot of power and have a short lamp life and poor light distribution characteristics. As shown in FIG. 8, the distance between the lamp and the signboard surface must be long.
An object of the present invention is to solve the above-described problems in a light-emitting panel and to provide a light-emitting panel incorporating a reduction in power consumption, a long life, an improvement in light distribution characteristics, a reduction in panel thickness, and the like.

In order to solve the above problems, the present invention uses an electroluminescent fiber as a light source in place of a conventional fluorescent lamp.
As shown in FIG. 1, the electroluminescent fiber 6 is a phosphorescent material 2.5 containing a rare earth element as an activator in an alkaline earth aluminate between a core electrode 1 having a concentric structure and a spiral additional electrode 4. It is coated in layers. As a product example of the light source, a tube shape having an outer diameter of 2.5 mm and a length of up to 800 m can be used. When a power supply of 400 Hz is used, power consumption is 5 W per 100 m.

As shown in FIG. 2, the tube-shaped electroluminescent fiber 6 is inserted into a transparent flat plate 7 made of glass, acrylic or the like by cutting a groove, and arranged so that the transparent flat plate 7 has substantially uniform illuminance. (Claim 1)

At that time, as shown in FIG. 3, the electroluminescent fibers 6 are arranged in a reciprocating manner in a folded shape or a spiral shape as an arrangement for uniform illuminance. (Claim 2)

In the light-emitting panel according to claim 1 or 2, LEDs 9 are arranged at equal intervals on the end face of the transparent flat plate 7 as an auxiliary light source as shown in FIG. (Claim 3)

The LED 9 and the light guide plate 8 having a wedge-shaped cross-section are combined and arranged alternately. (Claim 4)

6. The light-emitting panel according to claim 1, wherein LEDs 9 and light guide plates 8 are alternately arranged at equal intervals on the end face of the transparent flat plate as an auxiliary light source for stacking the light-emitting panels in a multi-layered manner to make the light emission illuminance uniform as shown in FIG. To do. (Claim 5)

At that time, as shown in FIG. (Claim 6)

When the light-emitting panel of the present invention is used with commercial power, for example, the amount of power is 10 W, which is 1/10 that of a fluorescent lamp signboard.

The life of the electric field fiber used for the light-emitting panel is said to be about 6 years, so the maintenance time is three times longer than that of a conventional fluorescent lamp.

In the light emitting panel of the present invention, the distance between the light source and the signboard surface can be reduced to 40 mm, and the thickness of the signboard body can be reduced to about 1/25 compared to the case where 250 mm of the fluorescent lamp light source is required.

When a solar cell is used as the power source, the electric power consumption is 10 W with the electroluminescent fiber with respect to the fluorescent lamp 100 W, and the electricity charge is free.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, an electroluminescent fiber 6 that is a tube-like light emitter is inserted into a transparent flat plate 7 such as glass or acrylic as shown in FIG. 2 so that the transparent flat plate 7 has a substantially uniform illuminance. In this case, as an arrangement for obtaining uniform illuminance, it is assumed that the electroluminescent fibers 6 are arranged in a fold shape or a spiral shape as shown in FIG.
As an auxiliary light source, LEDs 9 and a light guide plate 8 are arranged at equal intervals on the end surface of the transparent flat plate 7 as shown in FIG. At that time, the multilayer stacks are arranged alternately in the vertical and horizontal directions. As shown in FIG. 6, a light-emitting panel in which a multi-layer stack is alternately arranged vertically and horizontally.

The light-emitting panel of the present invention can be installed without relying on conventional signboards and indicator lamps that use commercial power, and without restricting the area, so that the market can be expanded and energy saving is also expected to contribute to society. It will be possible.

The figure which shows the structure of the electroluminescent fiber of a light emission panel Diagram showing the arrangement of electroluminescent fibers on a transparent flat plate such as glass or acrylic Diagram showing an array of electroluminescent fibers folded back and forth or spirally Diagram showing LED arrangement as auxiliary light source (wedge drill) The figure which shows arrangement | positioning of LED as an auxiliary light source The figure which shows the arrangement | sequence of the multilayer stack of the light emission panel. The figure which shows the arrangement of the vertical and horizontal alternate of the light emission panel Figure showing an example of fluorescent lamp array currently used for signboards

Explanation of symbols

1: Core electrode 2: Phosphor layer 3: Electroluminescent element layer 4: Load electrode 5: Phosphor layer 6: Electroluminescent fiber 7: Transparent flat plate 8: Light guide plate 9: LED

Claims (6)

A light-emitting panel, characterized in that an electroluminescent fiber, which is a tubular light-emitting body, is inserted into a transparent flat plate made of glass, acrylic or the like by cutting a groove so that the transparent flat plate has almost uniform illuminance. 2. The light emitting panel according to claim 1, wherein the electroluminescent fibers are arranged in a folded shape or a spiral shape in a reciprocating manner as an arrangement for uniform illuminance. 3. The light emitting panel according to claim 1, wherein LEDs are arranged at equal intervals on an end face of a transparent flat plate as an auxiliary light source and a light guide plate having a wedge-shaped cross section is provided. 3. The light emitting panel according to claim 1, wherein LEDs and wedge-shaped light guide plates are alternately arranged in combination. 4. A multilayered light emitting panel, wherein the light emitting panels are stacked to form a single light emitting panel to make the light emission illuminance uniform. The light-emitting panel according to claim 5, wherein the multi-layer stack is alternately arranged in the vertical and horizontal directions.

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