KR100919176B1 - Led projection lighting-lamp for signboard - Google Patents

Abstract

Disclosed are LED projection lighting for billboards such as bus stops.

LED projection lighting for billboards according to the present invention is a printed circuit board formed with a groove along a longitudinal direction on one surface; A plurality of LEDs each mounted on a bottom surface of a groove formed in the printed circuit board; A plurality of lenses covering surfaces of each of the LEDs and refracting light emitted from the LEDs; Transparent tempered glass covering an upper surface of the groove formed in the printed circuit board; And a heat dissipation plate coupled to the other surface of the printed circuit board and absorbing and dissipating heat generated by the driving of the plurality of LEDs, wherein the printed circuit board on which the plurality of LEDs are mounted includes an edge of one side of an advertisement board. And light emitted from the plurality of LEDs is emitted to one surface of the advertisement board through the light guide plate, and the portion where the printed circuit board and the heat sink are coupled is sealed with epoxy.

Description

LED projection lighting lamps for billboards

The present invention relates to a LED (Light Emitting Diode) projection lighting lamp for billboards, and more specifically, to emit light in an edge type by using the LED as a light source to the billboards such as bus stops to exhibit higher brightness and longer life than conventional fluorescent lamps It relates to a LED projection lamp for advertising billboards.

In order to illuminate an advertising board installed in a bus stop or the like, fluorescent lamps are generally used. In the case of fluorescent lamps, a gas discharge tube is used by injecting gas into the glass tube, which may cause air pollution when the gas leaks due to burnout of the glass tube, and when the brightness is to be brightened, power consumption increases accordingly. Since there is a need to perform a proper power line construction, there was a problem such as excessive cost of the facility and maintenance.

On the other hand, as an alternative to solve the problem of the above-mentioned bulbs, in recent years, the development of lighting fixtures using LEDs with low power consumption has been proposed. In the case of LED lighting fixtures, LEDs having high brightness and high lifespan are applied, with high lifetime. Intense light emission is possible.

On the other hand, when the LED is used as a light source for a billboard lighting, a large amount of heat is generated when driving the LED, and there is a fear that rainwater or the like may flow into a portion exposed to the outside. Accordingly, there is a demand for a LED projection lighting lamp for billboards having a structure that ensures waterproof and heat-dissipating functions and can improve luminous efficiency to the billboard.

One problem to be solved by the present invention is to completely replace the fluorescent lamps that are currently used as a light source of the billboard, and to provide a LED projection lamp for billboards that can increase the reflection efficiency.

Another problem to be solved by the present invention is to provide a LED projection lighting lamp for a high-life billboard by having a waterproof and heat-dissipating function, to prevent degradation of the LED or other components in using the LED as a light source of the billboard.

LED projection lighting for a billboard according to an embodiment of the present invention for achieving the above object is a printed circuit board formed with a groove along a longitudinal direction on one surface; A plurality of LEDs each mounted on a bottom surface of a groove formed in the printed circuit board; A plurality of lenses covering surfaces of each of the LEDs and refracting light emitted from the LEDs; Transparent tempered glass covering an upper surface of the groove formed in the printed circuit board; And a heat sink coupled to the other surface of the printed circuit board to absorb and release heat generated by the driving of the plurality of LEDs.

In this case, in the LED projection lamp according to the present invention, a printed circuit board on which the plurality of LEDs are mounted is disposed at an edge of one side of the billboard, so that light emitted from the plurality of LEDs is emitted to one surface of the billboard through the light guide plate. It is characterized by.

In addition, the LED projection lamp according to the present invention is characterized in that the portion bonded to the printed circuit board and the heat dissipation plate is waterproofed as it is sealed with epoxy.

LED projection lamp according to the present invention can replace the fluorescent lamp conventionally used as a light source of the billboard, there is an effect that can exhibit a long life and high brightness.

In addition, the LED projection lamp according to the present invention is sealed by epoxy, etc., the portion where the printed circuit board and the heat sink are combined is waterproof so that rainwater does not penetrate into the lamp, and the heat sink or reflective layer made of aluminum has high thermal conductivity. The heat generated when driving the LED can be effectively absorbed and released.

Figure 1 schematically shows a billboard to which the present invention can be applied.

Figure 2 schematically shows a one-way vertical section of the LED projection lamp for billboards according to an embodiment of the present invention.

3 schematically illustrates that a plurality of LEDs are mounted in grooves formed in a printed circuit board.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the LED projection lamp for billboards according to a preferred embodiment of the present invention.

Figure 1 schematically shows a billboard to which the present invention can be applied.

Referring to FIG. 1, the LED projection lamp 110 for a billboard according to the present invention is mounted at one side edge of the billboard 100 installed at a bus stop or the like, and has a structure using the LED 112 as a light source.

The LED projection lamp 110 for a billboard according to the present invention operates on a principle similar to a so-called edge type back light unit applied to an LCD (Liquid Crystal Display). Therefore, light emitted through the LED projection lamp of the present invention at one edge, that is, the edge of the billboard, is emitted to the billboard through the light guide plate inside the billboard.

Figure 2 schematically shows a one-way vertical section of the LED projection lamp for billboards according to an embodiment of the present invention.

Referring to FIG. 2, the LED projection lamp 110 for advertising according to the present invention includes a printed circuit board 210, a plurality of LEDs 220, a plurality of lenses 230, a transparent tempered glass 240, and a heat sink 250. )

A groove is formed in one surface of the printed circuit board 210 along the longitudinal direction (long direction), and a plurality of LEDs 220 are mounted on the bottom surface 211 of the groove. The plurality of LEDs 220 are preferably arranged at regular intervals.

The grooves formed on one surface of the printed circuit board 210 may be formed by only one line along the length direction, and may be formed by two lines, as shown in FIG. 2, if necessary. It is also possible.

A lens 230 is formed on the upper portion of each of the plurality of LEDs 220 to cover the surface of each of the LEDs 220 and to refract light emitted from the LEDs 220. The reason why the lens 230 is employed in the present invention is that the general LED emits light only in the straight direction, so that a part of the light emitted in the straight direction is refracted to achieve even light emission of the entire lamp.

The transparent tempered glass 240 covers the upper surface 212 of the groove formed in the printed circuit board. The reason for using the transparent tempered glass 240 in the present invention is to prevent the deterioration (deterioration) of the LED 220 or other components, such as foreign matter is put into the LED (220). In the case of the transparent tempered glass 240, it is possible to emit the light emitted from the LED 220 toward the light guide plate as much as possible due to the transparent property, and also has the advantage that can withstand the heat generated when driving the LED 220 due to the nature of the tempered glass have.

Heat sink 250 is coupled to the other surface of the printed circuit board 210, and serves to support the printed circuit board 210 and absorbs and releases heat generated by the driving of the plurality of LEDs 220. It plays a role. In order to play this role, the heat sink 250 may be made of a metal having excellent thermal conductivity such as aluminum.

The printed circuit board 210 may be coupled to the heat sink 250 by adhesion. However, the printed circuit board 210 may form a coupling groove (not shown) along both edges of the upper part of the heat sink 250, and the printed circuit board 210 may be formed on the heat sink 250. ) May be easier to combine in a sliding form. When the printed circuit board 210 is coupled to the heat sink 250, the heat sink 250 may serve as a case of the LED projection light of the present invention as well as pure heat dissipation function, and may be used in a method such as die casting. It can be produced easily.

A gap may occur in a coupling portion of the printed circuit board 210 and the heat sink 250. When the LED projection lamp for a billboard according to the present invention is mounted on a billboard, rain water may penetrate the printed circuit board through the gap. Thus, in the present invention, the above problem is solved by waterproofing the portion where the printed circuit board 210 and the heat sink 250 are coupled. Waterproofing is epoxy, which is widely used as a waterproof or sealing material, such as a portion where the printed circuit board 210 and the heat sink 250 are coupled or a portion where the transparent tempered glass 240 and the printed circuit board 210 are coupled. By sealing the back and the like.

3 schematically illustrates a plurality of LEDs arranged in grooves formed in a printed circuit board. Referring to FIG. 3, it can be seen that a plurality of LEDs 220 are arranged along the length direction of the printed circuit board 210.

2 and 3, in order to increase the reflection efficiency in the LED projection lighting for billboards according to the present invention, the substrate 110, other than the bottom surface of the plurality of grooves, that is, the top surface 212 and the wall surface of the grooves A reflective layer was formed at 213.

The reflective layer may be made of an aluminum plate. In this case, the aluminum plate not only functions as a reflective layer, but also performs a function of heat dissipation along with the lower heat sink 250.

On the other hand, the reflective layer is 10 to 30 parts by weight of polydiorganosiloxane, 5 to 15 parts by weight of bismuth oxide glass frit, 5 to 10 parts by weight of ammonium fluoride, and P-phenolsulfonic acid based on 100 parts by weight of the hydroxy group-containing acrylate compound. It may be composed of a non-conductive composition containing 5 to 10 parts by weight of sodium salt.

The non-conductive reflective layer made of the above materials is non-conductive and does not affect a circuit pattern formed on a printed circuit board, and reflects light emitted from each of the plurality of LEDs 220 to improve luminous efficiency.

Example

In order to measure the reflectance of the reflective layer made of the above materials, the following experiment was performed.

1. Preparation of Specimen

Example 1

100 g of hydroxy group-containing acrylate compound, 10 g of polydiorgano siloxane, 5 g of bismuth oxide glass frit, 5 g of ammonium fluoride, and 5 g of sodium P-phenol sulfonate salt were mixed to prepare a specimen having a thickness of 2 mm.

Example 2

A specimen was prepared in the same manner as in Example 1 by mixing 100 g of a hydroxy group-containing acrylate compound, 30 g of polydiorgano siloxane, 15 g of bismuth oxide glass frit, 10 g of ammonium fluoride, and 10 g of sodium P-phenolsulfonate salt.

Comparative Example 1

A specimen was prepared in the same manner as in Example 1 by mixing 100 g of a hydroxy group-containing acrylate compound, 5 g of polydiorganosiloxane, 10 g of bismuth oxide glass frit, 10 g of ammonium fluoride, and 3 g of sodium P-phenolsulfonate salt.

Comparative Example 2

A specimen was prepared in the same manner as in Example 1 by mixing 100 g of a hydroxy group-containing acrylate compound, 20 g of polydiorgano siloxane, 25 g of bismuth oxide glass frit, 10 g of ammonium fluoride, and 5 g of sodium P-phenolsulfonate salt.

Comparative Example 3

A specimen was prepared in the same manner as in Example 1 by mixing 100 g of a hydroxy group-containing acrylate compound, 10 g of polydiorgano siloxane, 5 g of bismuth oxide glass frit, 1 g of ammonium fluoride, and 9 g of sodium P-phenolsulfonate salt.

The compositions shown in Examples 1 to 2 and Comparative Examples 1 to 3 are summarized in Table 1.

TABLE 1

2. Reflectance Measurement and Evaluation Method

The reflectance was measured using a reflectometer (CM3500d, manufactured by Minolta, Japan) to measure reflectance at wavelengths of 470 nm for blue, 520 nm for green, and 650 nm for red.

When the silver reflectance was 100%, evaluation made 85% or more of reflectances into good (o), and made it into the defect (x) below.

3. Results and Analysis

The reflectance evaluation results are shown in Table 2.

TABLE 2

Referring to Table 2, in the case of Examples 1 to 2, all of the reflectance was good at 85% or more at 470 nm corresponding to blue, 520 nm corresponding to green, and 650 nm corresponding to red.

On the other hand, in Comparative Example 1, the reflectance was not good at 85% or less at 470 nm corresponding to blue and 650 nm corresponding to red, and in Comparative Example 2, at 650 nm corresponding to red, green for Comparative Example 3 At 520 nm, the reflectance was less than 85%, indicating a relatively poor reflectance.

Accordingly, the reflective layer formed by properly mixing the materials is non-conductive, and does not affect the circuit pattern formed on the printed circuit board, and the light having any wavelength in the visible light shows excellent reflectance.

As described above, the LED projection lamp for billboards according to the present invention can increase the luminous efficiency by emitting the light emitted from the LED toward the light guide plate as much as possible. In addition, through the heat dissipation and waterproof function, it is possible to prevent the deterioration of the function of the lamp, thereby extending the life of the lamp.

Although the above has been described with reference to one embodiment of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

Claims (5)

A printed circuit board having a groove formed on one surface along a length direction; A plurality of LEDs each mounted on a bottom surface of a groove formed in the printed circuit board; A plurality of lenses covering surfaces of each of the LEDs and refracting light emitted from the LEDs; Transparent tempered glass covering an upper surface of the groove formed in the printed circuit board; And A heat sink coupled to the other surface of the printed circuit board and absorbing and dissipating heat generated by driving the plurality of LEDs; The printed circuit board on which the plurality of LEDs are mounted is disposed at an edge of one side of the billboard, and the light emitted from the plurality of LEDs is emitted to one surface of the billboard through the light guide plate. The portion to which the printed circuit board and the heat sink are coupled is sealed with epoxy, The portion of the printed circuit board other than the bottom surface of the groove in which the LED is mounted is covered with an aluminum plate, so that the aluminum plate reflects and radiates heat. LED projection illumination lamp for billboards, characterized in that the grooves for coupling the printed circuit board is formed on both edges of the upper portion of the heat sink. A printed circuit board having a groove formed on one surface along a length direction; A plurality of LEDs each mounted on a bottom surface of a groove formed in the printed circuit board; A plurality of lenses covering surfaces of each of the LEDs and refracting light emitted from the LEDs; Transparent tempered glass covering an upper surface of the groove formed in the printed circuit board; And A heat sink coupled to the other surface of the printed circuit board and absorbing and dissipating heat generated by driving the plurality of LEDs; The printed circuit board on which the plurality of LEDs are mounted is disposed at an edge of one side of the billboard, and the light emitted from the plurality of LEDs is emitted to one surface of the billboard through the light guide plate. The portion to which the printed circuit board and the heat sink are coupled is sealed with epoxy, 10 parts by weight of polydiorganosiloxane and 5 to 15 parts by weight of bismuth oxide-based glass frit based on 100 parts by weight of the hydroxy group-containing acrylate compound in the printed circuit board other than the bottom surface of the groove where the LED is mounted. A non-conductive reflecting layer comprising 5 parts by weight of 5 parts by weight of ammonium fluoride and 5 to 10 parts by weight of sodium P-phenol sulfonate is formed. The method according to claim 1 or 2, One side of the printed circuit board is formed with a plurality of grooves in the longitudinal direction, LED projection lamp for billboards, characterized in that the LED is mounted along a plurality of lines (line). The method of claim 2, LED projection illumination lamp for billboards, characterized in that the grooves for coupling the printed circuit board is formed on both edges of the upper portion of the heat sink. The method according to claim 1 or 2, The heat sink is a LED projection lamp for billboards, characterized in that made of aluminum material.