KR100924856B1 - Surface lighting apparatus having a simple structure to mount LEDs on light guide plate - Google Patents

Abstract

The present invention relates to a surface light emitting device in which an LED is mounted in a simple coupling structure at a desired position of a light guide plate for inducing LED light. The surface light emitting device of the present invention includes a light guide plate having a reflecting surface is formed to induce light incident from the side surface; And PCs provided with LEDs and fixed to the LGP in a state in which the LEDs are positioned on the side surfaces of the LGP. As a result, the present invention can reduce the size and weight of the product, and easily install it in a narrow space, thereby improving workability and lowering the manufacturing cost of the product.

Lighting, LED, LED, LGP, Billboard

Description

Surface lighting apparatus having a simple structure to mount LEDs on light guide plate}

DETAILED DESCRIPTION A detailed description of embodiments of the present invention will be made with reference to the accompanying drawings, in which like numbers designate corresponding parts in the drawings.

1 is a perspective view showing a surface light emitting device using a conventional LED,

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an assembled perspective view showing an embodiment of a surface light emitting device that simplifies a structure for mounting an LED according to the present invention on a light guide plate,

4 is an exploded perspective view of FIG. 3,

5 is a cross-sectional view taken along the line B-B of FIG.

6 is a cross-sectional view showing an embodiment of the LED lead wire connecting structure in FIG.

7 is a cross-sectional view showing another embodiment of the LED lead wire connection structure in FIG.

8 is a cross-sectional view showing a cross-sectional structure of a printed circuit board (PCB) in which the LED is configured in the present invention,

9 is a cross-sectional view showing another embodiment of a surface light emitting device with a simplified structure for mounting an LED according to the present invention on a light guide plate.

** Explanation of symbols for main parts of drawings **

110: light guide plate 112: fastening hole

114: entry groove 120: printed circuit board

122: government 130: fastening member

140: fixing part 150: LED array

152: LED 154: lead wire

156: resistance 160: reflective film

The present invention relates to a lighting device using an LED (Light Emitting Device), and more particularly, by mounting the LED to a desired position of the light guide plate for inducing the light of the LED in a simple coupling structure to reduce the size and weight of the product in a small space The present invention relates to a surface light emitting device that simplifies a structure in which an LED is mounted on a light guide plate, which is easy to install and improves workability as well as lowers a manufacturing cost of a product.

In recent years, surface light emitting apparatuses combining LEDs and light guide plates have been widely used in various fields such as lighting, advertising, and guidance. Such a surface light emitting device is equipped with an LED on the side of the light guide plate having a reflective surface on the back side, so that light emitted from the LED enters the inside of the light guide plate, scatters and reflects from the reflecting surface, and is emitted to the front of the light guide plate to obtain a light emitting effect. do. Here, the term 'light guide plate' collectively refers to all plate-like structures that perform a function of inducing light. In particular, the reflective surface of the light guide plate reflects the LED light to the front by carving various patterns or pictures. In this way, the LED surface light emitting device can be used as an illumination and as a billboard or a guide cover, if the pieces contain advertisement contents or guide text, respectively. For example, in the case of an application to a billboard, a transparent plastic light guide plate in which the advertisement contents are engraved, and an LED mounted on the side of the light guide plate to emit light from the side of the light guide plate and pass through the inside of the light guide plate while being engraved on the light guide plate. By scattering and reflecting against the light is projected to the front of the light guide plate, the advertising content is displayed. One example of such a conventional surface light emitting device is shown in FIGS. 1 and 2.

1 is a perspective view showing a surface light emitting device using a conventional LED, Figure 2 is a cross-sectional view taken along the line A-A of FIG.

1 and 2, the conventional surface light emitting device 10 is mounted in the LED mounting frame 40 having a complicated cross-sectional shape in order to arrange the LEDs 30 on both sides of the light guide plate 20. Insert the printed circuit board 32 with the LEDs 30 attached to the space 42 at regular intervals, and then mount the mounting frame 40 on both sides of the light guide plate 20 and screw. Fastening (not shown) to arrange the LEDs 30 on both sides of the light guide plate 20.

As described above, in the conventional surface light emitting device 10, an aluminum mounting frame 40 having a thick and complicated shape is used to assemble the LEDs 30 on the side surface of the light guide plate 20. For this reason, the cost for manufacturing the mounting frame 40 and the assembly is cumbersome, which leads to a disadvantage in that the manufacturing cost increases and the productivity decreases. Furthermore, since the printed circuit board 32 having the LEDs 30 arranged therein is accommodated in the mounting frame 40, the thickness and width of the mounting frame 40 are thicker and larger than those of the light guide plate 20. There was a problem that both sides of the protruding from the front and rear surfaces of the light guide plate 20. As a result, it became an obstacle to the miniaturization of the product, and raised a problem of being restricted when installed in a narrow space.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks, by mounting the LED in the desired position of the light guide plate for inducing the light of the LED in a simple coupling structure to reduce the size and light weight of the product and easy installation in narrow space The present invention provides a surface light emitting device with a simplified structure for mounting an LED on a light guide plate, which can improve not only the manufacturing cost but also lower the manufacturing cost of the product.

According to an aspect of the present invention, there is provided a light emitting device having a simplified structure for mounting an LED according to an embodiment of the present invention, a light guide plate having a reflecting surface formed to induce light incident from a side thereof; And a printed circuit board having LEDs and fixed to the LGP in a state where the LEDs are positioned on the side of the LGP.

The printed circuit board may include a fixing part fixed to the rear surface of the light guide plate, and an LED array part coupled to the fixing part at right angles to arrange the LEDs at equal intervals in parallel with the side surfaces of the light guide plate.

In accordance with another aspect of the present invention, a surface light emitting device having a simplified structure for mounting an LED according to another aspect of the present invention has a side surface recessed in a longitudinal direction to form an entry groove, and a reflective surface is formed at the side thereof. A light guide plate which induces incident light and emits light; And an LED array unit in which the LEDs entering the entrance grooves of the light guide plate are arranged at regular intervals, and are coupled to the LED array unit at a right angle, and are fixed to the rear surface of the light guide plate to position the LED array unit on the side of the light guide plate. It includes a printed circuit board having a.

In this case, the LED array portion is accommodated in the entry groove, it is preferable that the end of the fixing portion is disposed so as not to deviate from the line parallel to the side end surface of the light guide plate.

In accordance with another aspect of the present invention for achieving the above object, a surface light emitting device that simplifies a structure for mounting an LED on a light guide plate is recessed along a longitudinal direction in the middle to form a groove, and a reflective surface is formed at the side thereof. A light guide plate which induces incident light and emits light; And an LED array unit in which LEDs entering the grooves of the light guide plate are arranged at regular intervals, coupled to the LED array at right angles, and fixed to a rear surface of the light guide plate to position the LEDs from the middle of the light guide plate toward the side. Includes a printed circuit board with a government.

In this case, a pair of the printed circuit boards facing the back is disposed in the groove of the light guide plate, and the pair of the printed circuit boards are preferably arranged with the LED array parts facing the back in the groove. Do.

The fixed part and the LED array is composed of printed circuit boards,

In some cases, the fixing unit and the LED array unit may be coupled by lead wires for supplying electricity to the LEDs through the LED array unit from the fixing unit to which external power is supplied.

The lead wires may be connected inward or outward of the fixing part and the LED array.

Preferably, the fixing portion and the LED array portion are coupled in a T or L shape.

The fixing part is formed with holes at regular intervals, and the light guide plate corresponding to the holes is formed with fastening holes, and the fastening member penetrates the fastening holes to the fastening holes to fasten the fixing part to the light guide plate. It is good to fix.

It is preferable that the copper layer and the lead layer which are excellent in heat generation are coated on the printed circuit board on the rear surface of the fixing part and the LED array board.

A reflective film may be further provided between the fixing part and the light guide plate to reflect light emitted from the LEDs into the light guide plate.

The surface light emitting device of the present invention is configured by directly mounting a printed circuit board on which LEDs are arranged at regular intervals to the side surface of the light guide plate. To this end, an entrance groove is provided along the longitudinal direction of the light guide plate, and LEDs attached to the surface of the printed circuit board protruding therefrom enter the entrance groove to emit light from the side of the light guide plate. In this way, the LEDs are arranged toward the side of the light guide plate and then the PCB is fixed to the light guide plate. At this time, a fastening means such as a screw or bolt is used as the fixing means.

Furthermore, the apparatus may be configured by fixing a printed circuit board to the rear surface of the light guide plate in a state in which a groove is formed in a desired portion even in the middle of the light guide plate and the LEDs are entered in the groove as described above.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Figure 3 is an assembled perspective view showing an embodiment of a surface light emitting device with a simplified structure for mounting the LED according to the present invention, Figure 4 is an exploded perspective view of FIG. 5 is sectional drawing along the BB line | wire of FIG.
The surface light emitting device 100 of the present invention includes a light guide plate 110 for guiding light and emitting light to a surface, and an LED printed circuit board 120 mounted directly on the side surface of the light guide plate 110 (hereinafter, referred to as a 'printed circuit board'). '). The printed circuit board 120 may be mounted on at least one side of the light guide plate 110. In this embodiment, the printed circuit board 120 is fixed to face opposite sides of the light guide plate 110.

As a fixing means for directly fixing the printed circuit board 120 to the light guide plate 110, the apparatus includes a fastening member 130. The fastening member 130 may be a screw or bolt. In order to fix the printed circuit board 120 to the light guide plate 110 with the fastening member 130, a hole 122 is provided in the printed circuit board 120, and the light guide plate 110 corresponding to the hole 122 is fastened to the light guide plate 110. The ball 112 is formed. Therefore, the fastening member 130 enters through the hole 122 of the printed circuit board 120 and is fastened to the fastening hole 112 of the light guide plate 110 to attach the printed circuit board 120 to the side surface of the light guide plate 110. It will be fixed. Substantially, the fastening hole 112 may allow the fastening member 130 to enter the light guide plate 110 to form a female spiral in the light guide plate 110 while the male thread of the fastening member 130 rotates.

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The printed circuit board 120 includes a fixing part 140 fixed to the light guide plate 110 and an LED array part 150 coupled to the fixing part 140 at a right angle. The fixing unit 140 and the LED array unit 150 is preferably composed of a printed circuit board, respectively. For example, the fixing unit 140 and the LED array 150 is coupled to each other in a T-shape or L-shape. At this time, the fixing part 140 is fixed in close contact with the rear surface of the light guide plate 110, whereby the LED array unit 150 coupled to the right angle is positioned facing the side of the light guide plate 110. In the LED array unit 150, the LEDs 152 are arranged at predetermined intervals on the corresponding surface side of the light guide plate 110. The lead wires 154 for supplying power to the LEDs 152 are wired from the fixing part 140 to the LED arranging part 150. 150 is combined. That is, the lead wires 154 for supplying power to the LEDs 152 also function as a means for coupling the fixing unit 140 and the LED array unit 150. Therefore, there is no need for a separate coupling unit for coupling the fixing unit 140 and the LED array unit 150 to simplify the configuration and reduce the manufacturing cost. The lead wire 154 is made of copper or other electrically conductive metal material, and is designed to have a thickness and strength enough to join two printed circuit boards. The printed circuit board 120 is provided with resistors 156 for stabilizing power supplied to the LEDs 152.

The LED array unit 150 is formed to extend in the longitudinal direction of the light guide plate on the side of the light guide plate 110, LED 152 in the longitudinal direction of the LED array unit 150 is arranged at regular intervals, resulting As such, the LEDs 152 are arranged at predetermined intervals along the longitudinal direction of the light guide plate 110 on the side surface of the light guide plate 110. Preferably, the entrance groove 114 is formed on the side of the light guide plate 110 facing the LED array unit 150 such that the LEDs 152 of the LED array unit 150 are stably received on the side of the light guide plate 110. This side surface is formed along the longitudinal direction. That is, since the printed circuit board 120 is coupled with the light guide plate 110 in a state where the LED array unit 150 enters and is received in the entrance groove 114 of the side of the light guide plate 110, the apparatus is connected to the printed circuit board 120. The coupling structure of the light guide plate 110 may achieve a more simplified, simplified and stable coupling structure. This eliminates the need for additional attachments such as a frame for mounting the LEDs 152, and ultimately, the surface light emitting device 100 is completely integrated with the light guide plate 110 so that the surface light emitting device 100 is light guide plate 110. Can be manufactured to approximately the same size as).

As shown in FIG. 5, the LED array unit 150 is located inward of the side end portion of the light guide plate 110, and thus the end portion of the fixing part 140 is aligned with the side end portion of the light guide plate 110. It is desirable to be located in the phase. In addition, the reflective film 160 is attached to the rear surface of the light guide plate 110 on which the LEDs 152 are disposed so that the light emitted from the LEDs 152 is completely reflected into the light guide plate 110 and is incident. It is more preferable at the point of light utilization efficiency. Of course, the light guide plate 110 has a reflective surface 116 for processing the light emitted from the LEDs 152 to the front surface of the light guide plate 110. The reflective surface 116 may be carved into a V-cutting, a picture, or a character, and may be used as a simple lighting device or other advertisement board, guide board, or the like depending on the content of the engraving. Furthermore, the depth d of the fastening member 130 entering the light guide plate 110 to increase the light utilization efficiency by avoiding the light emitted from the LEDs 152 from interfering with the fastening member 130 is greater than that of the light guide plate 110. Very small for the thickness. Preferably, the fastening depth d is set to 1/3 or less of the thickness of the light guide plate. In addition, the fastening member 152 is positioned between the LED and the LED to avoid interference with the fastening member of the LED light.

6 is a cross-sectional view showing an embodiment of the LED lead wire connecting structure in Figure 5, Figure 7 is a cross-sectional view showing another embodiment of the LED lead wire connecting structure in FIG.

The LED lead wires 154a and 154b combine the fixing parts 140a and 140b and the LED array parts 150a and 150b as described above, in addition to the original function of the power line supplying power to the LEDs 152a and 152b. It functions as a coupling member. These lead wires 154a may be connected to the LED array 150a at the fixing portion 140a to the inside where the LEDs 152a are arranged as shown in FIG. 6. Alternatively, as illustrated in FIG. 7, the fixing part 140b and the LED arraying part (on the opposite surface side of the LED arraying part 150b on which the LEDs 152b are arranged, that is, the outer surface side of the LED arraying part 150b). 150b) can be connected to receive power. As such, when the lead wires 154b are configured on the outer surface side of the LED array unit 150b, heat dissipation may be improved as compared to those formed on the inner surface side of the LED array unit 150a as shown in FIG. 6.

As exemplified above, the lead wires 154a and 154b are connected to the LED array parts 150a and 150b from the fixing parts 140a and 140b, thereby supplying power applied to the fixing parts 140a and 140b from the outside. The LEDs 152a and 154b are supplied to the LEDs 152a and 152b through the LED arrays 150a and 150b.
FIG. 8 is a cross-sectional view illustrating a cross-sectional structure of a printed circuit board (PCB) in which the LED is configured in the present invention, and illustrates a cross-sectional structure for improving heat dissipation of the fixing part and the LED array of the printed circuit board.

To this end, copper coating layers 140-1 and 150-1 are coated on the outer surfaces of the printed circuit boards 140 and 150, and then lead coating layers 140-3 and 150-3 are coated thereon. That is, since copper and lead have better heat dissipation than plastic, which is a material of a printed circuit board, the copper coating layers 140-1 and 150-1 and lead coating layers 140-3 and 150-are applied to the surface of the printed circuit boards 140 and 150. Coating 3) in turn helps the heat generated during the operation of the LEDs to be discharged quickly to the outside.

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9 is a cross-sectional view showing another embodiment of a surface light emitting device with a simplified structure for mounting an LED according to the present invention on a light guide plate.

The surface light emitting device (100c) is applied to any portion of the light guide plate (110c) as well as the side of the light guide plate (110c) by directly coupling the printed circuit board (120c ~ 120f) coupled to the letter T to the light guide plate (110c). I can attach it. For example, a small groove 118c is dug in the middle of the light guide plate 110c at its rear side, and the LED array portions 150e and 150f enter the groove 118c as shown in FIG. Coupling at the end of the light guide plate 110c described in detail in the previous embodiment by fastening the fixing parts 140e and 140f coupled to the back surface of the light guide plate 110c by fastening members 130c to 130f. Similarly, simple combinations are possible.

As described above, the method of combining two opposing printed circuit boards 120e and 120f with the back in the middle groove 118c of the light guide plate 110c on the left and right sides of the light guide plate 110c described in the previous embodiment. When applied together with the method of coupling the 120d, it is possible to mount the printed circuit board anywhere in the light guide plate 110c. At this time, the LEDs 152c and 152e arranged on the intermediate printed circuit board 120e facing the left printed circuit board 120c among the left printed circuit board 120c and the middle printed circuit boards 120e and 120f are disposed. If it is set to the same color, the surface emission color of the light guide plate 110c between them becomes the color light of the LEDs. Also, the LEDs 152d and 152f arranged on the other middle printed circuit board 120f facing the right printed circuit board 120d among the right printed circuit board 120d and the middle printed circuit boards 120e and 120f. If the same color as the above and the left printed circuit board (120c) and the intermediate printed circuit board (120e) opposite to the same color to separate the area in one light guide plate (110c) to enable surface emission of different colors Can be. Here, an example in which surface emission of two different colors is illustrated is illustrated, but application of this may simply achieve surface emission of three or more different colors.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by these embodiments, Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

As described above, the surface light emitting device according to the present invention can be mounted in a simple coupling structure of the LED at the desired position of the light guide plate by directly fixing the printed circuit board on which the LEDs are arranged. As a result, the device can be reduced in size and weight, and can be easily installed even in a narrow space, thereby improving workability. In addition, by omitting the side mounting frame from the existing product has the effect of improving the productivity and assembly and lowering the manufacturing cost of the product.

Furthermore, according to the present invention, two or more different colors can be expressed by dividing an area in one light guide plate. In other words, since the user can set various light colors or brightnesses according to a desired pattern for each area of the light guide plate, when used as a display device, an advertisement effect can be enhanced.

Such a surface light emitting device can be used in various applications such as indoor decoration, billboards, sign display device, outdoor decoration. For example, the present invention may be applied to indicators such as indoor / outdoor billboards, guide boards, traffic signs, and the like. In addition, the field of application is expected to be very wide, such as being applicable to the back light of the liquid crystal display (LCD) or general lighting.

Claims (12)

A reflective surface is formed on the rear surface, and an L-shaped entry groove is formed along at least one side edge of the rear surface, and guides the light incident from the side of the entrance groove to the reflective surface to guide the front surface from the reflective surface. A light guide plate for reflecting toward the surface; And LED having an LED array in which LEDs are arranged at intervals, and a fixing portion connected to the LED array and coupled to the rear surface of the light guide plate so that the LEDs installed on the LED array face the side of the entrance groove. Including a printed circuit board, The LED array is fixed to the fixed portion by the lead wires for supplying electricity to the LEDs, The LED array and the fixed portion is a surface light emitting device for simplifying the structure for mounting the LED to the light guide plate, characterized in that connected to the L-shaped or T-shaped. delete delete delete According to claim 1, Grooves recessed toward the front surface is formed along the middle portion between the two edges of the rear surface of the light guide plate, The LED array part which is led in the recessed groove is arranged at intervals and the LED array part is connected to the LED array and coupled to the back surface of the light guide plate, the LEDs entering the recessed groove face the side of the recessed groove. The L-shaped or T-shaped LED printed circuit board having a fixing portion to further simplify the structure for mounting the LED to the light guide plate, characterized in that the surface light emitting device. The method of claim 5, wherein the LED printed circuit board having the LEDs entered into the recessed groove is a pair of LED array parts in which the LEDs entered into the recessed grooves are arranged in pairs facing each other A surface light emitting device that simplifies the structure of mounting an LED on a light guide plate. delete The surface light emitting device of claim 1, wherein the lead wires are connected to the LED array portion from the fixing portion toward the surface on which the LEDs are installed. The surface light emitting device according to claim 1, wherein the lead wires are connected to the LED array toward the surface where the LEDs are not installed in the fixing part. The method of claim 1, wherein the fixing portion is formed in the holes are spaced apart, the fastening holes are formed on the back surface of the light guide plate corresponding to the holes, the fastening member through the holes to fasten to the fastening holes The surface light emitting device of claim 1, wherein the fixing part is fixed to the rear surface of the light guide plate. The method of claim 1, wherein the copper layer and lead layer having excellent heat dissipation are sequentially coated on the rear surface of the fixing part, and the copper layer and lead layer having excellent heat generation are sequentially coated on the rear surface of the LED array portion. A surface light emitting device that simplifies the structure of mounting an LED to a light guide plate. The surface light emitting device of claim 1, further comprising a reflective film between the fixing part and the light guide plate to reflect light emitted from the LEDs into the light guide plate. Lighting equipment.

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