KR101657295B1 - Direct-type led planar lighting device - Google Patents

Abstract

The present invention relates to a direct-type LED planar lighting apparatus. The direct-type LED planar lighting apparatus includes a planar light switching member and a plurality of LED elements disposed on one side of the planar light switching member. The planar light switching member includes a transparent plate having a planar shape. The transparent plate is provided therein with: a plurality of reflective grooves corresponding to each of the LED elements and having first reflective surfaces inclined downwards, at an upper surface of the transparent plate; and a plurality of accommodation grooves for accommodating the LED elements, respectively, at a lower surface of the transparent plate. The lower surface of the transparent plate makes close contact with an upper surface of a printed circuit board mounted thereon with the LED elements, and a reflective pattern is processed with respect to an area, where the accommodation grooves are excluded, of the lower surface of the transparent plate. In addition, the planar light switching member includes the transparent plate and a light guiding lens which is inserted into or mounted on the transparent plate and of which an upper end protrudes from the upper surface of the transparent plate. The apparatus is thin and miniaturized so that excellent illuminance uniformity and light switching efficiency are implemented and an ornament effect on emitting light is obtained at the same time.

Description

DIRECT-TYPE LED PLANAR LIGHTING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface lighting apparatus using an LED element, and more particularly to a direct-type LED surface lighting apparatus.

In general, a surface illuminating device using an LED device is divided into an edge type and a direct type according to the arrangement of the LED device on the emitting surface. In the edge type and direct type, Such as a light guide plate or a diffuser plate.

The conventional edge type surface illuminating device has a structure in which an LED element is disposed on a side surface of a light guide plate as a surface light switching member. The light incident from the LED element to the side surface of the light guide plate is totally reflected in the light guide plate, And the LED point light source irradiation direction and the surface light source irradiation direction to be switched out are perpendicular to each other. Such an edge type surface illuminating device has advantages of being generally made to have a uniform illuminance and thin shape, but the light conversion efficiency is low and the illuminance at the edge is relatively higher than the center of the emitting surface in spite of the uniform illuminance There is a disadvantage that the thickness of the bezel is relatively large. In addition, there are a relatively large number of related parts including a light guide plate for guiding emitted light to the emitting surface, which may complicate assembly and increase the cost.

On the other hand, referring to Fig. 1, the conventional direct-type surface illuminator 1 is arranged such that the LED elements 3 mounted on the printed circuit board 4 in a regular arrangement are arranged on the back surface of the diffuser plate 2, , The peripheral edge of the separately provided outer frame 5 is bent upward to form the overall contour. In this case, the printed circuit board 4 is mounted on the bottom surface of the outer frame 5 and the diffusion plate 2 and the transparent cover 6 are supported and fixed on the upper end side of the outer frame 5, (Not shown) such as beads in order to induce light scattering and diffusion. The light incident on the back surface of the diffuser plate 2 from the LED element 3 is diffused by the diffuser plate and then diffused by the surface of the diffuser plate as an exit surface. The planar light source irradiation directions are the same.

The direct-type surface illuminator 1 has a relatively small number of components and a simple structure, and can be easily assembled at low cost and high in light conversion efficiency. However, loss of light quantity due to beads in the diffusion plate 2 is inevitable The deviation from the illuminance uniformity of the emitted light is large depending on the distance between the LED element 3 as the point light source and the diffuser plate 2 as the surface light switching member. In particular, in order to uniformly illuminate the emitted light, The spacing between the elements 3 must be made large, so that it is difficult to manufacture the thin type, and in this case, the light conversion efficiency is relatively low. In addition, compared with the edge type surface illuminating device, the number of parts is relatively small, but there is a demand for reducing the number of parts.

The present invention is to provide a direct-type LED surface illuminator having excellent illumination uniformity and light conversion efficiency while reducing the thickness and size of the apparatus.

It is another object of the present invention to provide a direct-type LED surface illuminator to which a decoration effect for emitted light is simultaneously given.

The inventors of the present invention have focused on the disposition of the LED device inside the surface light conversion member including the transparent plate to reduce the thickness of the device in the process of developing the direct-type LED surface illuminator related to the above-mentioned problem, Reflection and retroreflection of a part of the irradiated light in the opposite direction to induce emitted light even outside the region where the LED element is disposed, thereby achieving excellent illumination uniformity and light conversion efficiency for the entire apparatus. The inventors of the present invention have also realized that, in relation to a method of retroreflecting and retroreposing a part of incident light, a method of using a transparent plate itself as a surface light switching member and a method of additionally providing a light guiding lens, It has been found that decorative effects can be imparted at the same time, and the present invention has been reached by further specifying the related mechanical design. The gist of the present invention based on such an idea and recognition of the above-mentioned problem is as follows.

(1) A direct-type LED surface illuminator comprising a surface light conversion member and a plurality of LED elements arranged on one surface side of the surface light conversion member, wherein the surface light conversion member includes a plate-like transparent plate, A plurality of reflective grooves formed on the upper surface of the substrate and corresponding to the plurality of LED elements, respectively, and having a first reflective surface inclined downward; And a plurality of receiving grooves formed on the lower surface of the transparent plate and accommodating the plurality of LED elements, wherein a reflection pattern is formed on an area of the lower surface of the transparent plate except for the receiving groove, Device.

(2) The direct under-type LED surface illuminator of (1), wherein the first reflection surface is a plane or a curved surface.

(3) The light emitting device according to (1), wherein the protruding portion protruding toward the LED element is provided on the inner upper surface of the receiving groove, and the second reflecting surface is inclined downwardly or curved. Type LED surface lighting device.

(4) A direct-type LED surface illuminator comprising a surface light switching member and a plurality of LED elements arranged on one surface of the surface light switching member, wherein the surface light switching member includes a plate- ; And a plurality of light guiding lenses inserted in the plurality of receiving holes so as to secure a space for accommodating the LED elements, wherein each of the plurality of light guiding lenses has at least one of a top surface and a bottom surface And a reflection pattern is formed on the lower surface of the transparent plate except for the receiving hole.

(5) The direct underlying type LED surface illuminator according to (4), wherein the upper end of the light guiding lens is installed to protrude from the upper surface of the transparent plate.

(6) The light guiding lens is provided with a reflective groove corresponding to the LED element on the upper surface thereof, and the reflective surface is a first reflective surface provided in the reflective groove and inclined downwardly or in a curved shape. (4).

(7) The light guiding lens according to any one of (1) to (7), wherein the light guiding lens is provided with a convex portion protruding toward the LED element, and the reflection surface is a second reflection surface provided on the convex portion and inclined downward 4) directly under the LED surface lighting device.

(8) A direct-type LED surface illuminator comprising a surface light converting member and a plurality of LED elements arranged on one surface side of the surface light diverting member, wherein the surface light converting member comprises a plate-like transparent plate; And a plurality of light guiding lenses mounted on the transparent plate, wherein the transparent plate includes: a plurality of reflective grooves formed on the upper surface thereof and corresponding to the plurality of LED elements, each having a first reflective surface inclined downward; And a plurality of receiving grooves formed on the lower surface and accommodating the plurality of LED elements, wherein each of the plurality of light guiding lenses has a convex portion formed on the bottom surface thereof so as to conform to the shape of the reflection groove, Wherein the light guide plate is mounted so as to correspond to the reflection groove and the upper end of the light guide lens is mounted to protrude from the upper surface of the transparent plate and a reflection pattern is formed on the lower surface of the transparent plate except for the receiving groove. Lighting device.

(9) The light emitting device according to (8), wherein the protruding portion protruding toward the LED element is provided on the inner upper surface of the receiving groove, and the second reflecting surface is inclined downwardly or curved. Type LED surface lighting device.

(10) The light guiding lens is provided with a second reflective groove corresponding to the LED element on the upper surface thereof, and the third reflective surface is provided with a third reflective surface having a flat or curved shape inclined downwardly. (8).

(11) The direct underlying type LED surface illuminator of (8), wherein the convex portion is provided with a fourth reflective surface of a flat or curved shape inclined downward.

(12) The direct-type LED surface illuminator according to any one of (1) to (11), wherein the reflection pattern is a point shape or a linear concavo-convex shape.

(13) The direct-type LED surface illuminator as described in any one of (1) to (11), wherein the reflection ink is integrally coated on the reflection pattern of the transparent plate.

(14) The direct-type LED surface illuminator according to any one of (1) to (11), wherein the peripheral portion of the printed circuit board is bent upward to have a frame-like structure.

(15) The direct-type LED surface illuminator according to any one of (1) to (11), wherein the lower surface of the transparent plate and the upper surface of the printed circuit board on which the LED element is mounted closely contact.

INDUSTRIAL APPLICABILITY The LED surface illuminator according to the present invention improves the structure of the transparent plate and the arrangement of the LED element and the arrangement thereof as the surface light switching member, thereby providing a thin and compact, excellent luminance uniformity and light conversion efficiency.

Further, the LED surface illuminating device according to the present invention may be configured such that the surface light diverting member is composed of a light guide lens inserted in a transparent plate and a transparent tube or mounted on a top surface, and the structure of the transparent plate and the light guide lens, And the decorative effect on the outgoing light can be simultaneously given.

Further, the LED surface illuminating device according to the present invention can improve the assemblability and the cost by minimizing the component parts by improving the structure of the surface light changing member and the PCB structure mounting the LED element.

1 is a structural view of a direct-type LED surface finishing apparatus according to the prior art.
2 is an exploded perspective view of a direct-type LED surface illuminator according to a first embodiment of the present invention;
FIG. 3 is a structural view of a direct-type LED surface illuminator according to the embodiment of FIG. 2. FIG.
FIG. 4 is a schematic view of an optical path in the embodiment of FIG. 2; FIG.
FIG. 5 is a photograph of a product of the direct-type LED surface illuminator manufactured according to the embodiment of FIG. 2, and a state of installation and use thereof.
6 is a structural view of a direct-type LED surface illuminator according to a second embodiment of the present invention.
FIG. 7 is a schematic view of an optical path in the embodiment of FIG. 6; FIG.
8 is a structural view of a direct-type LED surface illuminator according to a third embodiment of the present invention.
FIG. 9 is a schematic view of an optical path in the embodiment of FIG. 8; FIG.

Hereinafter, the present invention will be described in detail with reference to examples. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration of the embodiment described in the present specification is merely the most preferred embodiment of the present invention, and does not represent all the technical ideas of the present invention, so that various equivalents And variations may be made. On the other hand, in the drawings, the same or similar reference numerals are given to the same or equivalent elements in the drawings, and, in the entire specification, when a component is referred to as being "comprising" But may include other components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

FIG. 2 is an exploded perspective view of a direct-type LED surface illuminating device (hereinafter abbreviated as "device") according to a first embodiment of the present invention, and FIG. 3 is a structural view of a direct- Fig. 4 shows a schematic view of the optical path shown in an enlarged view of the portion A in the above apparatus.

The apparatus 10 comprises a group of a plurality of LED elements 300 arranged in a regular array on a printed circuit board 400 and a surface light switching member, The light source is converted into a planar light source by the surface light changing member. In this case, the plurality of LED elements 300 are disposed on one surface side of the surface light-diverting member, and are arranged in a direct-type structure in which the point light source irradiation direction of each LED element 300 and the surface light source irradiation direction emitted through the surface light- to be.

In the embodiment of FIG. 2, the surface light switching member is formed of a transparent plate 100, and the lower surface of the transparent plate 100 is in close contact with the upper surface of the printed circuit board 400. The transparent plate 100 is made of a transparent material such as acrylic resin or glass, and is not particularly limited. Reflecting grooves 110 and receiving grooves 120 are integrally formed on the upper surface and the lower surface of the transparent plate 100. The reflective grooves 110 and the receiving grooves 120 are formed on the lower surface of the transparent plate 100, A pattern 130 is formed. It is unnecessary to form particles such as beads for inducing light scattering and diffusion in the transparent plate 100 as in the conventional direct-type LED surface illuminator.

The reflective groove 110 is formed corresponding to each of the plurality of LED elements 300. In the embodiment, the reflective groove 110 is formed in a conical shape so that the first reflective surface 112 is inclined at an acute angle downward . The first reflection surface 112 reflects part of the light emitted from the LED element 300 in the opposite direction to the lower surface of the transparent plate 100 and the retroreflected light is reflected by the lower surface of the transparent plate 100 Reflected by the processing pattern 130 formed on the transparent plate 100, and is guided and emitted to the upper surface of the transparent plate 100.

Accordingly, the light emitted to the upper surface of the transparent plate 100 is scattered and diffused through the retroreflection and re-reflection process inside the transparent plate 100 in addition to the light directly emitted from the LED device 300, And is mixed with the planar light having a uniform roughness as a whole.

The receiving groove 120 receives each of the plurality of LED elements 300 and the lower surface of the transparent plate 100 is hermetically sealed to the upper surface of the printed circuit board 400 It is preferable that the space is formed in a sufficient space.

As shown in the drawing, a protrusion 121 protruding in a semicircular shape toward the LED element 300 may be optionally provided on the upper inner surface of the receiving groove 120. The protrusion 121 has a second reflective surface 122 curved downward at an acute angle. The second reflection surface 122 reflects part of the light emitted from the LED element 300 in the opposite direction back to the lower surface of the transparent plate 100 like the first reflection surface 112, The irradiation light reflected back by the reflection surface 122 is reflected again by the reflection pattern 130 formed on the lower surface of the transparent plate 100 and is guided and outputted to the upper surface of the transparent plate 100.

In this case, the light emitted to the upper surface of the transparent plate 100 is directly reflected by the light emitted from the LED element 300 through the transparent plate 100 and reflected by the second reflective surface 122 and the reflective pattern 130 ) And the indirectly emitted light due to the retroreflection and retroreflection between the first reflection surface 112 and the reflection pattern 130, and the second half The scattering diffusion or mixing effect of the light is enhanced by the indirectly emitted light induced by the slope 112 and the indirectly emitted light induced by the second reflecting surface 122, Lt; / RTI >

The reflection pattern 130 reflects the light reflected back by the first reflection surface 112 and the second reflection surface 122 and the light totally reflected from the specular surface of the transparent plate 100 to a total reflection critical angle or more, And may be a point shape or a linear convexo-concave shape as an element for guiding and exiting the upper surface of the plate 100 and guiding scattered and diffused light therein. In this case, the dot convexo-concave shape can be formed, for example, by sandblasting, and the linear convexo-concave shape can be, for example, a linear pattern having a V-shaped section cut into a regular grid shape.

Alternatively, the reflective pattern 130 of the reflective plate 100 may be integrally coated with the reflective ink 140 by screen printing or spraying. The reflection ink 140 is reflected by the first reflection surface 112 and the second reflection surface 122 or the light reflected by the reflection plate 130 in the presence of the reflection pattern 130 It is possible to maximize the light conversion efficiency and the brightness of the outgoing plane light by minimizing the light emitted or extinguished to the bottom surface of the transparent plate 100, while the printed circuit board 400 mounting the LED element 300 directly Thereby preventing exposure to deterioration or deformation.

On the other hand, the peripheral portion of the printed circuit board 400 is bent upward to form a frame-integrated structure. The printed circuit board 400 has a structure in which a resin layer 420 is laminated on a metal layer 410 and a circuit in which a circuit electrically connected to the LED element 300 is patterned is called a metal PCB. The metal layer 410 of the printed circuit board 400 thus forms the outer frame of the device 10 and simplifies the separate component elements of the conventional printed circuit board and the outer frame to make the device 10 thinner and lighter And it is possible to improve the assemblability.

In this case, the size of the periphery of the printed circuit board 400 may be substantially the same as the thickness of the transparent plate 100, and the transparent plate 100 may be formed in the inner space of the printed circuit board 400, So that the bezel region with respect to the upper emitting surface of the transparent plate 100 is minimized. The frame-integrated printed circuit board 400 and the transparent plate 100 may be attached to each other by using an adhesive 500 such as epoxy between the lower surface of the printed circuit board 400 and the upper surface of the transparent plate 100 , But it may be a structure that is fastened with a bolt or the like although not shown in the drawing.

In the present invention, the LED element 300 is completely housed in the receiving groove 120 of the transparent plate 100 so as not to increase the thickness of the entire device 10, Therefore, the transparent plate 100 can also serve as a protective cover in the conventional LED surface light source device, and thus the device 10 can be more advantageously thinned when it is constructed as a direct type.

FIG. 5 shows a product photograph, installation and use state diagram of the apparatus 10 manufactured according to the embodiment of FIG. As shown in FIG. 5 (a), it can be confirmed that the apparatus is made to be thin and made only of a frame-integrated printed circuit board and a transparent plate to minimize the component construction. 5 (b), a device manufactured in a thin shape can be installed in close contact with a ceiling surface. In this case, by using a bolt or the like penetrating a predetermined region of the transparent plate and the printed circuit board, As shown in FIG. As shown in Fig. 5 (c), it can be confirmed that the flat light emitted from the device in the illuminated state has a high luminance and a uniform emission quality in spite of being made thin. In the conventional direct type LED surface illuminator As a result, the volume of the device becomes large due to the fabrication of a rear mold inevitably for forming a uniform roughness, thereby making it possible to effectively solve the problem that the outer appearance becomes poor and the light conversion efficiency and luminance are lowered. Also, by minimizing the bezel area at the edge of the exit surface of the transparent plate, the interior effect can be maximized.

FIG. 6 is a structural view of a direct-type LED surface illuminator according to a second embodiment of the present invention, and FIG. 7 is a schematic view of a light path in the apparatus.

The apparatus 10 according to Fig. 6 is constituted by a group of a plurality of LED elements 300 arranged regularly on a printed circuit board 400 and a surface light switching member similarly to the apparatus according to Fig. 3, The LED element 300 is a direct lower structure disposed on one surface of the surface light diverting member. The lower surface of the transparent plate 100 included in the surface light converting member is in close contact with the upper surface of the printed circuit board 400 on which the LED device 300 is mounted, The reflection pattern 130 is processed for an area other than the reflection area. The reflection pattern 130 may have a shape of a dot or a line and may be a structure in which the reflection ink 140 is integrally coated on the reflection pattern 130 of the transparent plate 100, The peripheral portion of the substrate 400 may be bent upward to have a frame-like structure. Therefore, the operation of the present invention which is the same as that of the embodiment of FIG. 3 can be applied in the same manner, and a detailed description thereof will be omitted.

In the embodiment of FIG. 6, the surface light switching member includes a plate-shaped transparent plate 100 and a plurality of light guiding lenses 200. The transparent plate 100 is provided with a plurality of receiving holes 150 corresponding to the plurality of LED elements 300 and each of the plurality of the light conducting lenses 200 is inserted and fixed in the receiving hole 150.

In this case, it is preferable that the accommodating space is secured in a state where the light guiding lens 200 is inserted and fixed in the receiving hole 150 so that the LED element 300 can be received inside the transparent plate 100. To this end, a jaw portion is formed in the middle of the receiving hole 150, and the outer peripheral surface of the light guide lens 200 is formed in conformity with the inner peripheral surface shape of the receiving hole 150. In this case, the light guiding lens 200 may be a structure in which the light guiding lens 200 is simply press-fitted into the receiving hole 150 or fixed by adding an adhesive (not shown). The upper end of the light guide lens 200 may be installed to protrude from the upper surface of the transparent plate 100.

At least one of the upper surface and the lower surface of the light guide lens 200 may be provided with a reflective surface inclined at an acute angle downward. Such a reflective surface is basically a part of the light emitted from the LED element 300, And reflects back toward the lower surface of the plate 100. More specifically, such a reflective surface may be formed by forming a reflective groove 210 on the upper surface of the light guide lens 200 and forming a first reflective surface 212 inclined downwardly in the reflective groove 210, A semi-circular convex portion 221 may be formed on the lower surface of the lens 200 and a second reflective surface 222 may be provided on the convex portion 221 to be inclined downwardly. In the drawing, it is exemplified that both the first reflection surface 212 and the second reflection surface 222 are provided.

7, the light emitted to the upper side of the transparent plate 100 is directly reflected by the light emitted from the LED element 300 through the light guiding lens 200, the second reflection surface 222, Indirectly emitted light due to the retroreflection and retroreflection between the reflection patterns 130 and the light reflected by the first reflection surface 212 after passing through the light guiding lens 200, And the indirectly emitted light reflected again by the light source 130 is mixed. As in the embodiment of FIG. 3, the scattered light and the indirectly emitted light are scattered and mixed, Light.

On the other hand, in the embodiment of FIG. 7, in addition to the uniform surface light realization effect, the scattering effect of the first reflecting surface 212 with respect to the direct emitting light directly passing through the inside of the light guide lens 200, A decorative effect can be added. The decorative effect is particularly effective when the upper end of the light guide lens 200 protrudes from the upper surface of the transparent plate 100 so that all or a part of the first reflective surface 212 protrudes beyond the upper surface of the transparent plate 100, The inclination angles of the first reflective surface 212 surface elements can be more pronounced by being adjusted in various ways like the crystal surface.

FIG. 8 shows a structure of a direct-type LED surface illuminator according to a third embodiment of the present invention, and FIG. 9 shows a schematic view of a light path in the apparatus.

The apparatus 10 according to Fig. 8 is composed of a group of a plurality of LED elements 300 arranged regularly on a printed circuit board 400 and a surface light switching member, similarly to the apparatus according to Figs. 3 and 6 , And the plurality of LED elements 300 are direct-type structures arranged on one surface side of the surface light diverting member. The lower surface of the transparent plate 100 included in the surface light converting member is in close contact with the upper surface of the printed circuit board 400 on which the LED device 300 is mounted, The reflection pattern 130 is processed for an area other than the reflection area. The reflection pattern 130 may have a shape of a dot or a line and may be a structure in which the reflection ink 140 is integrally coated on the reflection pattern 130 of the transparent plate 100, The peripheral portion of the substrate 400 may be bent upward to have a frame-like structure. Therefore, the operation of the invention having the same structure as that of FIG. 2 and FIG. 6 can be applied equally, and a detailed description thereof will be omitted.

In the embodiment of FIG. 8, the surface light switching member includes a plate-shaped transparent member 100 and a plurality of light guide lenses 200A, as in the embodiment of FIG. 6, but unlike the embodiment of FIG. 6, The lens 200A is mounted on the upper surface of the transparent plate 100 without being inserted into the transparent plate 100. [

1, reflection grooves 110 and receiving grooves 120 are integrally formed on the upper surface and the lower surface of the transparent plate 100, as in the embodiment of FIG. The reflective groove 110 is formed in a conical shape corresponding to each of the plurality of LED elements 300. The reflective groove 110 is provided with a first reflective surface 112 inclined at an acute angle downward. The receiving groove 120 receives each of the plurality of LED elements 300 and a protrusion 121 projecting in a semicircular shape toward the LED element 300 is selectively provided on the inner upper surface of the receiving groove 120 . The protrusion 121 has a second reflective surface 122 curved downward at an acute angle. A coupling groove 160 is formed in a circumferential direction of the reflective groove 110 of the transparent plate 100 so as to be engaged with a coupling protrusion 260 provided in the light guide lens 220A. 8, the process of retroreflection and retroreflection between the first reflective surface 112 and the second reflective surface 122 of the transparent plate 110 and the reflective pattern 130, Scattering diffusion or mixing effect of light is the same as in the embodiment of FIG.

Each of the plurality of light guide lenses 200A has a convex portion 221A protruding from the bottom surface thereof and is engaged with the coupling groove 160 of the transparent plate 100 in the circumferential direction outside the convex portion 221A A fastening protrusion 260 is provided. In this case, the convex portion 221A is formed to conform to the shape of the reflective groove 110 so as to perform retroreflection with respect to light of the LED element 300 at the same reflection angle as the first reflective surface 112 . The convex portion 221A is provided with a fourth reflection surface 222A which is downwardly inclined at an acute angle. The light guiding lens 200A is mounted so that the convex portion 221A corresponds to the reflection groove 110. [ A second reflective groove 210A may be selectively formed on the upper surface of the transparent plate 100 and a third reflective surface 212A may be formed on the second reflective groove 210A in a downward acute angle. In the embodiment, the third reflection surface 212A and the fourth reflection surface 222A are both provided.

9, each of the plurality of light guide lenses 200A is mounted such that the convex portion 221A corresponds to the reflection groove 110 and the upper end of the light guide lens 200A is disposed on the upper surface of the transparent plate 100 As shown in Fig. In this state, the third reflection surface 212A and the fourth reflection surface 222A transmit a part of the transmitted light of the LED element 300 to the lower side of the transparent plate 100, similarly to the embodiment of FIG. Reflection and reflection process between the reflection pattern 130 and the scattering diffusion or mixing effect of the light. 6, a sparkling decoration effect is added by the scattering effect of the third reflecting surface 212A with respect to direct output light emitted directly through the inside of the light guide lens 200A The decorating effect may be such that all or a part of the third reflecting surface 212A protrudes beyond the height of the upper surface of the transparent plate 100 or the inclination angle of the third reflecting surface 212A As shown in FIG.

On the other hand, when comparing the embodiment of Fig. 6 with the embodiment of Fig. 8, in the embodiment of Fig. 6, a part of the light reflected from the first reflection surface 212 and the second reflection surface 222 of the light guiding lens 200 The third reflective surface 212A of the light guiding lens 200A and the third reflective surface 212B of the fourth reflective surface 200A of the light guiding lens 200A in the embodiment of FIG. 8 may not reach the reflective pattern 130 because they are blocked by the inner wall of the receiving hole 150 of the transparent plate 100, Most of the light reflected from the reflection surface 222A can be guided to the reflection pattern 130. [ In the embodiment of FIG. 6, the surface elements related to the retroreflection are the first reflection surface 212 and the second reflection surface 222 provided in the light guiding lens 200, while in the embodiment of FIG. 8, The third reflecting surface 212A and the fourth reflecting surface 222A provided on the first reflecting surface 112 and the second reflecting surface 122 and the light guiding lens 200A provided in the light guide plate 100 contribute to the re- do. Accordingly, the embodiment of Fig. 8 can be superior to the embodiment of Fig. 6 in terms of diffusion of emitted light, uniform illumination, brightness, and light conversion efficiency.

 INDUSTRIAL APPLICABILITY As described above, the LED surface illuminating device according to the present invention improves the structure of the transparent plate and the arrangement of the LED elements and the arrangement thereof as the surface light diverting member, so that it is thin and compact, and has excellent brightness uniformity and light conversion efficiency. Further, the LED surface illuminating device according to the present invention may be configured such that the surface light diverting member is composed of a light guide lens inserted in a transparent plate and a transparent tube or mounted on a top surface, and the structure of the transparent plate and the light guide lens, And the decorative effect on the outgoing light can be simultaneously given. Further, the LED surface illuminating device according to the present invention can improve the assemblability and the cost by minimizing the component parts by improving the structure of the surface light changing member and the PCB structure mounting the LED element.

The foregoing is a description of specific embodiments of the present invention. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments or constructions. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It should be understood that this is possible.

For example, in the embodiment of FIGS. 2 and 8, the reflective groove 110 of the transparent plate 100 is formed in a conical shape and the first reflective surface 112 provided in the reflective groove 110 is linear However, if the first reflection surface 112 has a downwardly inclined surface element so that the light incident from the LED element 300 can be reflected back to the lower surface of the transparent plate 100, The shape of the first reflection surface 112 is not particularly limited. For example, the reflection trench 110 may be formed as a polygonal pyramid or a semicircle, and the first reflection surface 112 may be formed as a plane and a curved surface . 8, the shape of the convex portion 221A of the light guiding lens 200A can be deformed to conform to the deformed shape of the reflection groove 110. In this case,

2 and 8, the protruding portion 121 formed on the inner upper surface of the receiving groove 120 is illustrated as being generally semicircularly embossed and having a curved second reflecting surface 122, Even when the protrusion 121 is formed, when the second reflective surface 122 has a downwardly inclined surface element so that the light incident from the LED element 300 can be reflected back to the lower surface of the transparent plate 110 The shape of the ramp protrusion 121 and the second reflecting surface 122 is not particularly limited and the second reflecting surface 122 may be formed in a planar and curved shape. When the first reflective surface 112 is provided on the transparent plate 100, the formation of the second reflective surface 122 through the protruding portion 121 is optional. In this case, It may be a simple horizontal surface or a concave depressed shape in the light irradiation direction.

6, the shape and structure of the reflection groove 210 and the first reflection surface 212 provided on the upper surface of the light guide lens 200 are the same as those of the transparent plate 100 in the embodiment of FIG. The reflective surface 110 and the first reflective surface 112 may be deformed in a manner similar to the modification of the reflective surface 110 and the first reflective surface 112 provided on the upper surface, The shape and structure of the second reflective surface 222 may be different from those of the second reflective surface 122 and the protrusion 121 selectively provided in the lower surface receiving groove 120 of the transparent plate 100 in the embodiment of FIG. Can be modified in a similar manner.

6, formation of any one of the first reflection surface 212 and the second reflection surface 222 is optional, and in the case where the first reflection surface 212 is not formed, The upper surface of the light guiding lens 200 may be formed as a simple flat surface or upwardly convex or in a crystal form according to a required decoration effect. When the second reflective surface 222 is not formed, As shown in Fig. In some cases, a receiving groove corresponding to the receiving groove 120 of the transparent plate 100 of FIG. 3 may be formed on the bottom surface of the light guide lens 200 of FIG.

8, the second reflective groove 210A and the third reflective surface 212A of the light guiding lens 200A are formed in the reflective grooves 210 and 210 of the light guiding lens 200 in the embodiment of FIG. The upper surface of the light guiding lens 200A can be changed in a simple plane or upward direction according to the required decorative effect when the third reflecting surface 212A is not formed, Or may be embodied in a crystal form.

It is therefore to be understood that all such modifications and alterations are intended to fall within the scope of the invention as disclosed in the following claims or their equivalents.

10: LED surface illuminator 100: transparent plate
110: reflection groove 112: first reflection surface
120: receiving groove 121:
122: second reflection surface 130: reflection pattern
140: reflective ink 150: receiving hole
160: fastening groove
200: a light-guiding lens
210: reflection groove 212: first reflection surface
221: convex portion 222: second reflecting surface
200A: a light-guiding lens
210A: second reflecting groove 212A: third reflecting surface
221A: convex portion 222A: fourth reflection surface
260: fastening projection
300: LED element
400: printed circuit board 410: metal layer
420: resin layer 500: adhesive

Claims (15)

And a plurality of LED elements arranged on one surface side of the surface light diverting member,
Wherein the surface light switching member includes a plate-like transparent plate,
Wherein the transparent plate comprises: a plurality of reflective grooves formed on the upper surface of the substrate, the plurality of reflective grooves being formed to correspond to the plurality of LED elements and inclined downward; And a plurality of receiving grooves formed in the lower surface and accommodating the plurality of LED elements,
Wherein a reflection pattern is formed on an area of the lower surface of the transparent plate except for the receiving groove,
Wherein a protruding portion protruding toward the LED element is formed on an inner upper surface of the receiving groove, and a second reflective surface of a flat or curved shape inclined downward is provided on the protruding portion. The direct-type LED surface illuminator according to claim 1, wherein the first reflection surface is a plane surface or a curved surface. delete And a plurality of LED elements arranged on one surface side of the surface light diverting member,
Wherein the surface light switching member includes: a plate-shaped transparent plate having a plurality of receiving holes; And a plurality of light guiding lenses inserted into each of the plurality of receiving holes, the plurality of light guiding lenses being inserted to secure a space for accommodating the LED elements,
Wherein each of the plurality of light guide lenses is provided with a reflective surface inclined downwardly on at least one of an upper surface and a lower surface thereof,
Wherein a reflection pattern is formed on an area of the lower surface of the transparent plate excluding the receiving hole. The direct-type LED surface illuminator according to claim 4, wherein an upper end of the light guiding lens is installed to protrude from an upper surface of the transparent plate. The light guide plate according to claim 4, wherein the light guiding lens is provided with a reflection groove formed in correspondence with the LED element on the upper surface thereof, and the reflection surface is a first reflection surface provided in the reflection groove and inclined downward Wherein the light emitting device is a direct-type LED surface light device. The LED according to claim 4, wherein a convex portion protruding toward the LED element is provided on a lower surface of the light guiding lens, and the reflection surface is a second reflection surface provided on the convex portion and inclined downwardly or in a curved surface form. Direct-type LED surface lighting device. And a plurality of LED elements arranged on one surface side of the surface light diverting member,
Wherein the surface light switching member is a plate-shaped transparent plate; And a plurality of light guiding lenses mounted on the transparent plate,
Wherein the transparent plate comprises: a plurality of reflective grooves formed on the upper surface of the substrate, the plurality of reflective grooves being formed to correspond to the plurality of LED elements and inclined downward; And a plurality of receiving grooves formed in the lower surface and accommodating the plurality of LED elements,
Each of the plurality of light guide lenses has a convex portion protruding from the bottom surface of the light guide lens so as to correspond to the shape of the reflection groove so that the convex portion corresponds to the reflection groove and the upper end of the light guide lens protrudes from the upper surface of the transparent plate ,
Wherein a reflection pattern is formed on an area of the lower surface of the transparent plate excluding the receiving groove. The LED according to claim 8, wherein a protruding portion protruding toward the LED element is formed on an inner upper surface of the receiving groove, and a second reflective surface of a flat or curved shape inclined downward is provided on the protruding portion. Surface illuminator. The light guide plate according to claim 8, wherein a second reflective groove is formed on the upper surface of the light guiding lens to correspond to the LED element, and a third reflective surface having a flat or curved shape inclined downward is provided in the second reflective groove Wherein the light emitting device is a direct-type LED surface light device. 9. The direct-type LED surface illuminator according to claim 8, wherein the convex portion is provided with a fourth reflective surface of a flat or curved shape inclined downward. The direct-type LED surface illuminator according to any one of claims 1, 2, and 4 to 11, wherein the reflection pattern is a pointed or linear concavo-convex shape. The direct-type LED surface illuminator according to any one of claims 1, 2, and 4 to 11, wherein reflection ink is integrally coated on the reflection pattern of the transparent plate.
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