JPH0572718B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an EL (electroluminescence) lamp.

BACKGROUND ART For example, a conventional electroluminescent lamp (hereinafter referred to as an EL lamp) is shown in FIG. 4, and FIG. 5 is a cross-sectional view taken along line A-A'. In both figures, a conductive transparent electrode 3 (for example, an ITO ₃ electrode) is formed on a transparent resin film 2 by vapor deposition or coating, and an aluminum electrode 5 is formed on a resin film 6 by vapor deposition or lamination. Apply flatly. A fluorescent material (for example, ZnS doped with Cu) 4 is sandwiched between these electrodes 3 and 5, and a lead 7 for external signal transmission is attached to each electrode 3 and 5, and then a wire other than the lead 7 is attached. is sealed with an insulating transparent resin film 1 (the end surface of the film 1 is isolated from the outside air by adhesive or thermal welding).

In addition, usually by applying several tens of V to several hundred V and a frequency of several hundred Hz to several KHz to the lead 7 part, the electrodes 3 and 5 are
The phosphor 4 in between emits light and can be visually observed 8 through the transparent electrode 3 side.

Problems to be solved by the invention However, in such EL lamps,
When exposed to thermal shock, each part deforms or contracts, causing it to no longer function normally. Figure 6 shows this situation. First, the phosphor 4 was initially
As is clear from the figure, the edges of the electrodes 3 and 5 were trimmed, but they contracted due to thermal shock, and the electrodes 3 and 5 were exposed at the edges. In addition, since each electrode 3, 5 has a different thermal expansion coefficient from the resin film 2, 6 on which it is applied, after several cycles of cold and heat shock, the conductive transparent electrode 3 and aluminum electrode 5 come into contact as shown in the figure. As a result, even if an electric signal is applied from the lead 7, it will shoot, and no voltage will be applied to the phosphor 4, which will no longer emit light.

The present invention is intended to solve these conventional problems, and aims to prevent an EL lamp from ceasing to emit light due to thermal shock.

Means for Solving the Problems In order to achieve the above object, the EL lamp of the present invention has the following features:
This is a configuration in which the outer dimensions of either the conductive transparent electrode 3 or the aluminum electrode 5 are smaller than the dimensions of the other electrode.

Function The EL lamp of the present invention has the effect that even if various parts undergo thermal deformation and contraction due to thermal shock, failures such as short circuit between electrodes will not occur.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, the conductive transparent electrode 3 is provided in advance so that the A dimension is shorter than the aluminum electrode 5. The amount of shrinkage of the phosphor and the amount of deformation of each part will vary depending on the overall size of the EL lamp, but 0.1 mm to several mm is usually sufficient (this will greatly hinder the effective light emitting area). (not very much).
FIG. 2 shows the state after a thermal shock is applied in this state. As is clear from FIG. 2, the aluminum electrode 5 is deformed and comes into contact with the upper transparent electrode film 2, but there is no conductive transparent electrode 3 there, and no short circuit occurs between the electrodes.

Figure 3 is a diagram of the EL lamp after thermal shock when the aluminum electrode 5 side is made shorter than the conductive transparent electrode 3, contrary to what was shown in Figures 1 and 2, and the effect is the same as the former. Effects can be obtained.

However, since the conductive transparent electrode 3 can be screen coated, the shape can be set more freely than the aluminum electrode 5 side, so it is more advantageous to machine the conductive transparent electrode 3 side during mass production.

Effects of the Invention As described above, according to the EL lamp of the present invention, the following effects can be obtained.

It can operate normally even under sudden thermal stress such as thermal shock.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an EL lamp according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the edge portion of the EL lamp of the present invention after a thermal shock test, and Fig. 3 is a cross-sectional view of an EL lamp according to another embodiment of the present invention. Figure 4 is an enlarged view of the cross-section of the edge after impact, Figure 4 is an external view of the EL lamp, Figure 5 is a cross-section of a conventional EL lamp, and Figure 6 is a cross-section of the edge of a conventional EL lamp after a thermal shock test. This is an enlarged view. DESCRIPTION OF SYMBOLS 1... Exterior film, 2... Film for transparent electrode, 3... Conductive transparent electrode, 4... Fluorescent material, 5...
...Aluminum (Al) electrode, 6...Aluminum (Al) electrode film, 7...Lead, 8...Viewing direction.

Claims (1)

[Claims] 1. A conductive transparent electrode is applied flatly on a transparent resin film, an aluminum electrode is applied flatly on a resin film by vapor deposition or lamination, and a phosphor is sandwiched between the electrodes,
Each electrode is provided with a lead for external signal transmission, and the other part is sealed with an insulating transparent resin film, and the outer periphery of either the conductive transparent electrode or the aluminum electrode is made smaller than the other electrode. An EL lamp characterized by its small size.