JPH1041552A - Led lamp and led display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen adhesion of dirt to LED lamps to facilitate the maintenance and control of the lamps, by a method in which a cooling layer consisting of a photocatalysit is provided on at least a light-transmitting region in the surface of an outer casing of each LED lamp. SOLUTION: In an LED lamp 100, a coating layer 150 is provided on the whole surface of an outer casing 110 having light transmission properties. This coating layer 150 is formed of a photocatalyst, such as a titanium oxide, and has light transmission properties. Moreover, in an LED display device 200, ultraviolet irradiating elements 210 are properly arranged among the LED lamps 100, which are arranged in large numbers in the form of matrix, for example, in such a way that ultraviolet rays are irradiated on all the LED lamps 100. The ultraviolet rays emitted from each ultraviolet irradiating element 210 are irradiated on the coating layers 150 on the surfaces of the outer casings of the lamps 100, a photocatalyst reaction is generated and dirt on the surfaces of the lamps 100 is decomposed. Accordingly, adhesion of the dirt to the LED lamps is decreased and the reduction in the luminous intensity of the lamps 100 due to the dirt can be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an LED lamp and an LED lamp.
The present invention relates to an ED display device. Specifically, an LED lamp with less stain on the lamp surface and having an antifouling effect and the LE
The present invention relates to an LED display device using a D lamp.

[0002]

2. Description of the Related Art FIG. 8 is a schematic internal structural view of a conventional LED lamp 100. The LED lamp 100 has a light emitting element 120 inside a light transmitting envelope 110 made of an epoxy resin or the like. A pair of leads 130 that are housed and electrically connected to the light emitting element 120 are drawn out through the element substrate 140. Light emitted from the light emitting element 120 passes through the envelope 110 and is emitted to the outside.

[0003] Such an LED lamp 100 has been used in more fields than before, for example, a large number of LEDs.
A lamp 100 is provided, and is used as various LED display devices such as a road information board for displaying various road conditions such as traffic congestion information and an advertising board for advertisement and publicity.

In these road information boards and advertising boards,
The surface of the enclosure 110 of the LED lamp 100 is continuously exposed to dirty air and wind and rain.
The luminous intensity of the ED lamp 100 decreases. For example, some experiments have shown that approximately two years of use results in a reduction in luminosity of as much as 40%. As a result, the display of the road information board and the advertising board becomes difficult to see, which has been a great obstacle to the performance of the LED display device.

[0005] The envelope 110 of the LED lamp 100
Although the luminous intensity of the LED lamp 100 is recovered by removing the dirt on the surface, a method of rubbing with, for example, a brush or a cloth has been used to remove the dirt.

[0006] However, such a method of rubbing with a brush or the like requires a lot of labor for work and has problems such as blocking road traffic, and is not an efficient removal method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to develop an LED display device which is easy to maintain by developing an LED lamp with less contamination. Is to provide.

[0008]

An LED lamp according to the present invention is an LED lamp including a light emitting element and a light-transmitting envelope in which the light-emitting element is accommodated. Characterized in that a coating layer made of a photocatalyst is provided at least in a light transmitting region.

At this time, it is preferable to provide an ultraviolet ray generating element inside the envelope, and it is desirable to use titanium oxide as a photocatalyst.

A first LED display device according to the present invention is characterized by arranging a large number of the LED lamps according to the present invention.

A second LED display device according to the present invention includes the above-described LED lamp of the present invention and an ultraviolet irradiation element for irradiating the coating layer of the LED lamp with ultraviolet light.

[0012]

1 (a) and 1 (b) are a front view and a side view, respectively, of an LED lamp 100 according to an embodiment of the present invention, and FIG. 2 is a sectional structural view showing a part of the LED lamp 100. FIG. 3 shows an LED display device 2 according to an embodiment of the present invention.
FIG. 4 shows another LED lamp 1 of the present invention.
FIG. 5 is a schematic configuration diagram of an LED display device 200 according to another embodiment of the present invention, and FIG. 6 is a schematic diagram of an LED display device 200 according to still another embodiment of the present invention. FIG. 7 is a block diagram showing a configuration of another embodiment L of the present invention.
FIG. 2 is a schematic internal structure diagram of the ED lamp 100. The details will be described below with reference to the drawings.

The LED lamp 100 of the present invention shown in FIG.
Has substantially the same structure as the conventional LED lamp 100. As shown in FIGS. 1 and 2, the LED lamp 100 has an envelope made of a light-transmitting epoxy resin or the like. 110, a coating layer 15
0 is provided.

The envelope 110 is made of a light-transmissive epoxy resin and has a light emitting element 120 molded therein.

The coating layer 150 is formed of a photocatalyst such as titanium oxide, and has a light transmitting property. In the present invention, the photocatalyst means a catalyst that promotes various chemical reactions such as an oxidation reaction and a reduction reaction by the energy of light, and is widely decomposed by irradiating light such as ultraviolet light with a decomposition reaction of a substance constituting a stain. The catalyst is not particularly limited as long as it promotes the reaction. However, in the present invention, in order for the light emitted from the light emitting element 120 to be emitted to the outside, a material having good light transmittance is selected. In this regard, titanium oxide is particularly preferable because it can form the transparent coating layer 150 having high light transmittance, but other photocatalysts can be used as long as they have a certain degree of light transmittance. When titanium oxide is used, anatase type titanium oxide is preferable because of its high activity.

The thickness of the coating layer 150 is not particularly limited.
A value of 0 is not preferable because light transmittance is reduced. Therefore, according to the luminous intensity of the LED lamp 100,
It is necessary to coat the photocatalyst to the desired thickness.

Exhaust gas contains a large amount of hydrocarbons and soot (carbon), and these exhaust gas components are supposed to scatter into the atmosphere and adhere to the surface of the LED lamp 100. ing. The photocatalyst titanium oxide is n
It is a type of type semiconductor, and is excited when irradiated with light in the near ultraviolet region of 400 nm or less, and generates holes and electrons in the titanium oxide coating layer 150. The holes cause an oxidation reaction as shown in the following equation 1,
Hydrocarbons and soot are decomposed.

[0018]

[Formula 1] Red (hydrocarbons, soot, etc.) + H + (hole)
→ Ox (oxide)

In addition to this reaction, the LED lamp 1
Oxygen in the surrounding atmosphere is activated by the electrons generated in the coating layer 150, and the active oxygen (O−,
O2- and O3-), and the generated active oxygen causes an oxidation reaction represented by the following formula 2.

[0020]

[Equation 2] O2 + e- (electron) → O2-O2- + Red → Ox

By these reactions, the LED lamp 100
The dirt attached to the surface of the coating layer 150 is decomposed and removed, and it is possible to prevent a decrease in the luminous intensity of the LED lamp 100 due to dirt.

Therefore, various LED display devices 200 such as a road display board and an advertising board as shown in FIG. 3 are constructed by arranging the LED lamps 100 of the present invention, so that maintenance of the LED display devices 200 such as cleaning work is performed. Can be simplified, and adverse effects such as traffic interruption due to maintenance can be eliminated. Further, since the cleaning of the LED display device 200 is not required, the chance of scratching the surface of the coating layer 150 of the LED lamp 100 is reduced, and the resin part, the metal part, or the protective coating of the LED lamp 100 is deteriorated by the cleaning agent. Is prevented, and the life of the LED lamp 100 and the LED display device 200 can be extended.

In the above embodiment, the coating layer 150 is provided on the entire surface of the envelope 110, but the coating layer 150 is partially coated on the surface of the envelope 110 where the light emitted from the light emitting element 120 is transmitted. A layer 150 may be formed.

Depending on the material of the envelope 110, it may be difficult to form the coating layer 150. In this case, as shown in FIG. What should I do? For the primer 160 layer, a material suitable for coating may be selected according to the photocatalyst and the material of the envelope 110 to be used. For example, in the case of coating titanium oxide, silica oxide, aluminum oxide or zirconium oxide is used. Can be used. As described above, if the coating layer 150 is formed after the primer layer 160 is formed in advance, not only the adhesion to the envelope 110 can be improved, but also the deterioration of the envelope 110 due to an oxidation reaction or the like by a photocatalyst can be prevented. .

In the LED lamp 100 and the LED display device 200, since the photocatalytic reaction represented by the equations (1) and (2) is used, ultraviolet rays are particularly required. Therefore, there is no particular problem when used outdoors where sunlight is applied, but in a place where sunlight is not applied such as in a tunnel or indoors, it is necessary to irradiate ultraviolet rays by some method. .

In the LED display device 200 shown in FIG. 5, for example, a large number of LEs of the present invention are arranged in a matrix.
An ultraviolet irradiation element 210 is appropriately arranged between the D lamp 100 and the LED lamp 100 so that all the LED lamps 100 are irradiated with ultraviolet light. Ultraviolet light emitted from each ultraviolet irradiation element 210 is
Irradiates the coating layer 150 to cause a photocatalytic reaction, thereby decomposing the dirt on the LED lamp 100 surface. The ultraviolet irradiation element 210 is not particularly limited as long as it emits ultraviolet light, and an incandescent lamp, a fluorescent lamp, a halogen lamp, a xenon lamp, a mercury lamp, a UV lamp, or the like can be used.

As described above, the LED display device 20 of the present invention
In the case of 0, since the ultraviolet irradiation element 210 is provided, it is possible to prevent dirt from adhering to the surface of the LED lamp 100 even in a place where ultraviolet light is not applied, such as in a tunnel or indoors. In particular, when applied to a road signboard or the like used in a tunnel, road traffic congestion due to a cleaning operation or the like can be prevented, and the effects of the present invention can be effectively exhibited.

The ultraviolet light emitted from the ultraviolet irradiation element 210 is applied to the coating layer 1 of each LED lamp 100.
If it is irradiated to 50, the arrangement place and the number of the ultraviolet irradiation elements 210 are not limited, for example,
As in the case of the LED display device 200 shown in FIG. 6, one LED display device 200 may be arranged at the upper end.

Further, in the LED lamp 100 shown in FIG. 7, the light emitting element 120 and the ultraviolet ray generating element 170 are molded inside the envelope 110, and the pair of leads 130 are electrically connected to the light emitting element 120. And another pair of leads 180 is connected to the ultraviolet ray generating element 1.
70 is electrically connected.

From the pair of leads 180, the ultraviolet ray generating element 1
When a voltage is applied to 70, ultraviolet rays are emitted from the ultraviolet ray generating element 170, and the emitted ultraviolet rays pass through the envelope 110 and irradiate the inner surface of the coating layer 150.
Therefore, regardless of the presence or absence of external ultraviolet light, the coating layer 150 is constantly irradiated with ultraviolet light, and the photocatalytic reaction represented by the above formulas 1 and 2 occurs on the surface of the coating layer 150, and Surface dirt can be reduced.

Therefore, by configuring the LED display device 200 using the LED lamp 100, the LED display device 200 can be easily used in a place where the amount of ultraviolet rays is small, such as in a tunnel or indoors. Moreover, the LED display device 20 shown in FIGS.
0, the ultraviolet irradiation element 210 is connected to the LED lamp 10.
It is not necessary to arrange it around the LED display device 20 or the like.
The structure of 0 can be simplified.

In the above-described embodiment, the envelope 110
Is made of an epoxy resin having optical transparency,
It may be a cap-shaped member formed of a material having light transmittance such as glass or plastics. In this case, the envelope 110 is hermetically attached to the element substrate 140.

[0033]

The LED lamp according to the present invention comprises a light emitting element,
An LED lamp including an envelope in which the light emitting element is housed, and a coating layer made of a photocatalyst is provided on at least a light transmitting region on a surface of the envelope.
Dirt adhering to the surface of the coating layer is decomposed by the action of the photocatalyst, so that the adhesion of dirt is reduced and the decrease in luminous intensity due to dirt can be reduced.

At this time, if an ultraviolet ray generating element is provided inside the envelope, the ultraviolet ray can be constantly irradiated from the ultraviolet ray generating element to the coating layer. Therefore, it can be used irrespective of the presence or absence of external ultraviolet rays, and can be effectively used even in places where external ultraviolet rays are not applied, such as in a tunnel or indoors.

When titanium oxide is used as the photocatalyst, a transparent coating layer can be formed, and the attenuation of light emitted from the light emitting element can be reduced.

The first LED display device according to the present invention is characterized by arranging a large number of the LED lamps according to the present invention, so that the surface of the LED lamp is less stained and maintenance such as cleaning can be simplified.

Also, a second LED display device according to the present invention is characterized by comprising the above-mentioned LED lamp of the present invention, and an ultraviolet irradiation element for irradiating the coating layer of the LED lamp with ultraviolet light. It can be effectively used even in a place where ultraviolet rays are not radiated from the outside, and especially when installed in a tunnel, traffic is not interrupted for maintenance, which is a very effective means.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a side view of an LED lamp according to an embodiment of the present invention, respectively.

FIG. 2 is a sectional view showing a part of the LED lamp according to the first embodiment;

FIG. 3 is a schematic configuration diagram of an LED display device according to an embodiment of the present invention.

FIG. 4 is a sectional structural view showing a part of an LED lamp according to another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of an LED display device that is another embodiment of the present invention using the LED lamp of the present invention.

FIG. 6 is a schematic configuration diagram of an LED display device using the LED lamp of the present invention, which is still another embodiment of the present invention.

FIG. 7 is a schematic internal structural view of an LED lamp according to another embodiment of the present invention.

FIG. 8 is a schematic internal structural view of a conventional LED lamp.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 LED lamp 110 envelope 120 light emitting element 150 coating layer by photocatalyst 170 ultraviolet ray generating element 200 LED display device 210 ultraviolet ray irradiating element

Claims (5)

[Claims] 1. An LED lamp comprising a light-emitting element and a light-transmitting envelope in which the light-emitting element is accommodated, wherein a coating layer made of a photocatalyst is formed on at least a light-transmitting region on the surface of the envelope. LED provided with
lamp. 2. The LED lamp according to claim 1, wherein an ultraviolet ray generating element is provided inside the envelope. 3. The LED lamp according to claim 1, wherein the photocatalyst is titanium oxide. 4. An LED display device comprising a large number of the LED lamps according to claim 1, 2 or 3. 5. An LE as claimed in claim 1, 2 or 3
An LED display device comprising: a D lamp; and an ultraviolet irradiation element that irradiates the coating layer of the LED lamp with ultraviolet light.