WO2017138679A1

WO2017138679A1 - Direct type led surface illumination apparatus

Info

Publication number: WO2017138679A1
Application number: PCT/KR2016/007268
Authority: WO
Inventors: 성진현
Original assignee: 성진현
Priority date: 2016-02-12
Filing date: 2016-07-05
Publication date: 2017-08-17
Also published as: KR101657295B1

Abstract

The present invention relates to a direct type LED surface illumination apparatus. The direct type LED surface illumination apparatus comprises: a surface lighting conversion member; and a plurality of LED devices disposed on one side of the surface lighting conversion member. The surface lighting conversion member comprises a plate shaped transparent plate. The transparent plate comprises: a plurality of reflective grooves, each having a first reflective surface inclined downward, which are formed on the upper surface to correspond to each of the plurality of LED device; and a plurality of receiving grooves formed on the lower surface to accommodate each of the plurality of LED devices, wherein the lower surface of the transparent plate and the upper surface of a printed circuit board on which the LED devices are mounted are in close contact with each other, and a reflective pattern is formed on the areas excluding the receiving grooves on the lower surface of the transparent plate. In addition, the surface lighting conversion member may consist of a transparent plate, and a light guiding lens which is inserted into the transparent plate or mounted on the upper surface of the transparent plate and of which upper end protrudes to the upper surface of the transparent plate. The apparatus is manufactured to be thin and compact to have excellent luminance uniformity and light conversion efficiency, and a decorative effect on outgoing light can be provided at the same time.

Description

Direct LED Surface Lighting

The present invention relates to a surface lighting device using an LED element, and more particularly to a direct type LED surface lighting device.

In general, a surface lighting device using an LED element is classified into an edge type and a direct type according to the arrangement of the LED element with respect to the emission surface. Both the edge type and the direct type use the LED point light source as the surface light source. And a surface light conversion member such as a light guide plate or a diffusion plate for converting the light into a light source.

Conventional edge type surface lighting apparatus has a structure in which an LED element is disposed on a side of a light guide plate, which is a surface light conversion member, and the light incident from the LED element to the side of the light guide plate passes through a total reflection process inside the light guide plate, The emitting surface is irradiated with surface light, and the LED point light source irradiation direction and the switched-out surface light source irradiation direction are perpendicular to each other. Such edge type surface lighting apparatus has an advantage of being generally uniform and having a low profile, but has low light conversion efficiency and relatively high illumination at the edge than the center of the exit surface despite the uniform illumination. There is a disadvantage that light leakage occurs and thus the bezel thickness is relatively large. In addition, there is a problem that the assembly is difficult and the cost is increased because there are a relatively large number of related parts, such as a light guide plate for inducing the outgoing light to the exit surface.

Meanwhile, referring to FIG. 1, the conventional direct type surface lighting apparatus 1 includes an LED element 3 mounted in a constant array on a printed circuit board 4, disposed on the back of the diffuser plate 2, which is a surface light conversion member. The peripheral edge of the outer frame 5, which is provided separately, is bent upward to form an overall appearance. In this case, the printed circuit board 4 is mounted on the bottom surface of the outer frame 5, the diffusion plate 2 and the transparent cover 6 are supported and fixed to the upper side of the outer frame 5, and the diffusion plate 2 ) Is a structure in which particles such as beads (not shown) are included therein to induce scattering and diffusion of light. The light incident from the LED element 3 to the rear surface of the diffuser plate 2 is diffused by the diffuser plate and then irradiated with surface light using the upper surface of the diffuser plate as an emission surface, The surface light source irradiation directions are the same.

Such a direct type surface lighting device 1 has a relatively small number of parts and a simple structure, and thus can be easily assembled at low cost, and has a high light conversion efficiency. However, light loss due to beads in the diffuser plate 2 is inevitable. According to the distance between the LED element 3, which is a point light source, and the diffuser plate 2, which is a surface light conversion member, the variation in the illuminance uniformity of the emitted light is large, and in particular, for the uniform illuminance of the emitted light, the diffusion plate 2 and the LED Since the spacing between the elements 3 should be increased, it is difficult to manufacture a thin film and in this case, the light conversion efficiency is relatively low. In addition, there is a relatively small number of parts compared to the edge-type surface lighting device, but there is a demand for reducing the number of parts.

The present invention is to provide a direct type LED surface lighting apparatus having excellent illuminance uniformity and light switching efficiency while thinning and miniaturizing the apparatus.

Another object of the present invention, in addition, to provide a direct type LED surface lighting device that is simultaneously given a decorative effect on the emitted light.

In the process of developing a direct type LED surface lighting device related to the above problem, the present inventors focus on placing the LED element inside the surface light conversion member including the transparent plate to reduce the thickness of the device. It was conceived that some of the irradiated light was reversely reflected and re-reflected in the opposite direction to induce outgoing light outside the region in which the LED element is disposed, thereby ensuring excellent illuminance uniformity and light conversion efficiency for the entire apparatus. In addition, the present inventors embody the method of using the transparent plate itself as a surface light conversion member and a method additionally provided with a light guide lens in relation to the method of retroreflecting and rereflecting a part of the incident light, while in the latter case, The present invention has been reached by further refining the relevant mechanical design, discovering that the decorative effect can also be imparted simultaneously. The gist of the present invention based on such an idea and the recognition of the problem is as follows.

(1) A direct type LED surface lighting apparatus comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member, wherein the surface light switching member includes a plate-shaped transparent plate, and the transparent plate A plurality of reflecting grooves formed corresponding to each of the plurality of LED elements on an upper surface thereof and having a first reflecting surface inclined downward; And a plurality of accommodating grooves formed at a lower surface to accommodate each of the plurality of LED elements, and wherein the reflective pattern is processed on an area except the accommodating groove among the lower surfaces of the transparent plate. Device.

(2) The direct-type LED surface lighting apparatus of (1), wherein the first reflective surface is an inclined surface having a flat or curved surface.

(3) The inner upper surface of the receiving groove is provided with a protrusion protruding toward the LED element side, the protrusion is provided with a second reflecting surface of the flat or curved form inclined downwardly directly below (1) Type LED surface lighting device.

(4) A direct type LED surface lighting apparatus comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member, wherein the surface light switching member is a plate-shaped transparent plate provided with a plurality of accommodation holes. ; And a plurality of light guide lenses inserted into each of the plurality of accommodating holes, the plurality of light guide lenses being inserted to secure an accommodation space in which the LED elements are accommodated. The inclined reflecting surface is provided, the direct type LED surface lighting apparatus, characterized in that the reflective pattern is processed for the area except the receiving hole of the lower surface of the transparent plate.

(5) The direct type LED lighting device of (4), wherein an upper end of the light guide lens is installed to protrude to an upper surface of the transparent plate.

(6) The upper surface of the light guide lens is provided with a reflecting groove formed corresponding to the LED element, the reflecting surface is provided in the reflecting groove is characterized in that the first reflecting surface of the planar or curved shape inclined downward Direct LED surface lighting apparatus of the above (4).

(7) The lower surface of the light guide lens is provided with a convex portion protruding toward the LED element, and the reflecting surface is provided with the convex portion and is a second reflecting surface having a flat or curved shape inclined downward ( 4), direct type LED surface lighting device.

(8) A direct type LED surface lighting apparatus comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member, wherein the surface light switching member comprises: a plate-shaped transparent plate; And a plurality of light guide lenses mounted on the transparent plate, wherein the transparent plate comprises: a plurality of reflecting grooves formed corresponding to the plurality of LED elements on an upper surface thereof and having a first reflecting surface inclined downward; And a plurality of accommodating grooves formed at a lower surface to accommodate each of the plurality of LED elements, wherein each of the plurality of light guide lenses has a convex portion protruding from the lower surface thereof so as to match the shape of the reflective groove. Directly mounted to correspond to the reflecting groove, the top of the light guide lens is mounted so as to project to the upper surface of the transparent plate, the direct type LED surface, characterized in that the reflective pattern is processed for the area except the receiving groove of the lower surface of the transparent plate Lighting device.

(9) The inner upper surface of the receiving groove is provided with a protruding portion protruding toward the LED element side, and the protruding portion is provided with a second reflecting surface of a flat or curved shape inclined downwardly. Type LED surface lighting device.

(10) an upper surface of the light guide lens is provided with a second reflecting groove formed corresponding to the LED element, and the second reflecting groove is provided with a third reflecting surface having a flat or curved shape inclined downwardly; The direct type LED surface lighting device of (8).

(11) The direct type LED lighting device of (8), wherein the convex portion is provided with a fourth reflecting surface having a flat or curved shape inclined downward.

(12) The direct type LED lighting device of any one of (1) to (11), wherein the reflective pattern is a dot or linear irregular shape.

(13) The direct type LED lighting device of any one of (1) to (11), wherein the reflective ink is integrally coated on the reflective pattern of the transparent plate.

(14) The direct type LED lighting device of any of (1) to (11), wherein the peripheral portion of the printed circuit board is bent upward to have a frame integrated structure.

(15) The direct type LED lighting device of any of (1) to (11), wherein the bottom surface of the transparent plate and the top surface of the printed circuit board on which the LED element is mounted are in close contact with each other.

The LED surface lighting apparatus according to the present invention has an improved illuminance uniformity and light switching efficiency, while being thin and compact, by improving the structure of the transparent plate, the LED element, and the arrangement form as the surface light conversion member.

In addition, the LED surface lighting apparatus according to the present invention comprises a light guide lens inserted into the transparent plate and the transparent tube or installed in the transparent plate and the transparent tube, and the above-mentioned through the structure of the transparent plate, the light guide lens and the LED element and arrangement form Along with the effect, the decoration effect on the emitted light can be given at the same time.

In addition, the LED surface lighting apparatus according to the present invention, through the improvement of the structure for the surface light conversion member and the PCB structure mounted with the LED element can minimize the component parts to improve the assembly and reduce the cost.

1 is a structural diagram of a direct type LED surface-surface device according to the prior art.

Figure 2 is an exploded perspective view of a direct type LED surface lighting apparatus according to a first embodiment of the present invention.

3 is a structural diagram of a direct type LED surface lighting apparatus according to the embodiment of FIG.

4 is a schematic diagram of an optical path in the embodiment of FIG.

5 is a product photograph, installation and use state of the direct type LED surface lighting device manufactured according to the embodiment of FIG.

6 is a structural diagram of a direct type LED surface lighting apparatus according to a second embodiment of the present invention.

7 is a schematic diagram of an optical path in the embodiment of FIG.

8 is a structural diagram of a direct type LED surface lighting apparatus according to a third embodiment of the present invention.

9 is a schematic diagram of an optical path in the embodiment of FIG. 8;

Hereinafter, the present invention will be described in detail through examples. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the configuration of the embodiments described herein is only one of the most preferred embodiments of the present invention and does not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of filing the present invention. It should be understood that there may be variations and variations. Meanwhile, in the drawings, the same or equivalent reference numerals are given the same or similar reference numerals. Also, in the entire specification, when a part is said to include a certain component, it is different from other components unless otherwise stated. It does not exclude the meaning that it may further include other components. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is an exploded perspective view of a direct type LED surface lighting apparatus (hereinafter, abbreviated as 'device') according to a first embodiment of the present invention; FIG. 3 is a structural diagram of the direct type LED surface lighting apparatus according to the apparatus; Figure 4 shows a schematic diagram of the optical path shown in the enlarged portion A in the device.

The device 10 is composed of a group of a plurality of LED elements 300 and a surface light conversion member which are regularly arranged and mounted in an array form on the printed circuit board 400, the point is emitted from each of the plurality of LED elements 300 The light source is switched to the planar light source by the surface light switching member. In this case, the plurality of LED elements 300 are disposed on one surface side of the surface light conversion member, and the direct light structure of the point light source irradiation direction of each LED element 300 and the surface light source irradiation direction emitted through the surface light switching member are the same. to be.

In the embodiment of Figure 2 the surface light conversion member is composed of a plate-shaped transparent plate 100, 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 a transparent material such as acrylic resin and glass, and is not particularly limited. Reflecting grooves 110 and receiving grooves 120 are integrally formed on each of the upper and lower surfaces of the transparent plate 100, and are reflected on an area of the lower surface of the transparent plate 100 except for the receiving grooves 120. The pattern 130 is formed. Inside the transparent plate 100, as in the conventional direct LED lighting device, particle formation such as beads for inducing scattering and diffusion of light is unnecessary.

The reflective groove 110 is formed to correspond to each of the plurality of LED elements 300, in the embodiment by being intaglio-shaped in the concave shape, the reflective groove 110 is provided with a first reflective surface 112 inclined downward acutely. . The first reflecting surface 112 reflects a part of the light emitted from the LED device 300 in the opposite direction to the lower surface of the transparent plate 100, and the reflected light reflects the lower surface of the transparent plate 100. The light is re-reflected by the reflective pattern 130 formed on the surface and guided 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 indirectly through the retroreflection and re-reflection process inside the transparent plate 100 in addition to the light directly emitted from the LED device 300 By mixing, it is realized as planar light having an overall uniform illuminance.

The accommodating groove 120 accommodates each of the plurality of LED elements 300, and the LED elements 300 are accommodated without interference so that the bottom surface of the transparent plate 100 is hermetically adhered to the upper surface of the printed circuit board 400. It is desirable to be formed with sufficient space so that it can be.

As shown in the drawing, a protrusion 121 protruding in a semicircular shape toward the LED device 300 may be selectively provided on an inner upper surface of the receiving groove 120. The protrusion 121 is provided with a second reflective surface 122 inclined downwardly in a curved shape. Like the first reflective surface 112, the second reflective surface 122 reflects a part of the light emitted from the LED element 300 in the opposite direction, that is, toward the lower surface of the transparent plate 100. The irradiated light reflected by the reflective surface 122 is reflected back by the reflective pattern 130 formed on the lower surface of the transparent plate 100 to be guided to the upper surface of the transparent plate 100.

In this case, the light emitted from the upper surface of the transparent plate 100 is a direct output light through which the light emitted from the LED device 300 passes through the transparent plate 100, the second reflecting surface 122 and the reflection pattern 130 ) The first half light is a mixture of indirect light emitted by mutual retroreflection and re-reflection, and indirect light emitted by retroreflection and re-reflection between the first reflective surface 112 and the reflective pattern 130. In addition to the indirectly emitted light induced by the slope 112, the scattering diffusion or mixing effect of the light is enhanced by the indirectly emitted light induced by the second reflecting surface 122 so that the planar light having a more uniform illumination as a whole It can be implemented as.

The reflective pattern 130 is transparent by reflecting the light reflected back by the first reflecting surface 112 and the second reflecting surface 122 and the light totally reflected from the upper mirror surface of the transparent plate 100 at a total reflection critical angle or more and is transparent. As an element for inducing outgoing onto the upper surface of the plate 100 and inducing scattering and diffused light therein, it may have a point or linear concave-convex shape. In this case, the dot-shaped concave-convex shape may be formed through, for example, sand blasting, and the linear concave-convex shape may be cut into a regular lattice, for example, in the form of a regular V-shaped cross section.

Optionally, the reflective ink 140 may be integrally coated on the reflective pattern 130 of the flat plate 100 by screen printing or spraying. The reflective ink 140 may be light reflected back by the first reflective surface 112 and the second reflective surface 122 or light totally reflected inside the transparent plate 100 may be present in the presence of the reflective pattern 130. Nevertheless, the transparent plate 100 minimizes light emitted or extinguished to maximize light conversion efficiency and brightness of the emitted light on the surface, and the printed circuit board 400 mounted with the LED device 300 is directly exposed to the light. Exposed to suppress degradation or deformation.

On the other hand, the periphery of the printed circuit board 400 is bent upward to form a frame integrated structure. To this end, the printed circuit board 400 has a structure in which the resin layer 420 is stacked on the metal layer 410, and a so-called metal having a structure in which a circuit electrically connected to the LED element 300 is patterned on the resin layer. It may be a PCB. Accordingly, the printed circuit board 400 and the metal layer 410 form the outer frame of the device 10, and the thinner and lighter the device 10 can be achieved by simplifying the separate components of the conventional printed circuit board and the outer frame. It is possible to improve the assembly.

In this case, the size at which the periphery of the printed circuit board 400 is bent corresponds to the thickness of the transparent plate 100, and the inner receiving space of the printed circuit board 400 at which the periphery is bent is transparent. It is desirable to minimize the bezel area to the upper exit surface of the transparent plate 100 by making it completely in contact with the. Combination of the frame-integrated printed circuit board 400 and the transparent plate 100 may be a structure attached between the lower surface of the printed circuit board 400 and the upper surface of the transparent plate 100 using an adhesive 500 such as epoxy. Although not shown in the drawings, the structure may be fastened using a bolt or the like.

In addition, in the case of the present invention, the LED device 300 is a structure that can be completely accommodated in the receiving groove 120 of the transparent plate 100 to be blocked from the outside at the same time without causing an increase in the thickness of the entire device 10 Therefore, the transparent plate 100 may serve as a protective cover in the conventional LED surface light source device, and thus may be more advantageous for thinning when the device 10 is configured in a direct type.

FIG. 5 shows a product photograph, installation and use state diagram of the device 10 fabricated according to the embodiment of FIG. 2. As shown in (a) of FIG. 5, it can be seen that the device is manufactured in a thin and minimized component configuration using only a frame-integrated printed circuit board and a transparent plate. In addition, as shown in (b) of FIG. 5, the thin device may be installed in close contact with the ceiling surface, and in this case, the ceiling surface may be formed using a bolt or the like penetrating a predetermined area of the transparent plate and the printed circuit board. It will be fixed in the installation. As shown in (c) of FIG. 5, the planar light emitted from the device in the lit state can be confirmed to have a uniform emission quality with high brightness despite being manufactured in a thin shape, and in the conventional direct type LED surface lighting device. As it is inevitably manufactured in a thick shape to form a uniform illuminance, the volume of the device is increased, so that the appearance is coarse, and the light conversion efficiency and luminance are deteriorated effectively. In addition, the edge of the exit face of the transparent plate minimizes the bezel area to maximize the interior effect.

6 shows a structural diagram of a direct type LED surface lighting apparatus according to a second embodiment of the present invention, and FIG. 7 shows a schematic diagram of an optical path in the apparatus.

The device 10 according to FIG. 6, like the device according to FIG. 3, is composed of a group of a plurality of LED elements 300 regularly arranged and mounted on a printed circuit board 400 and a surface light switching member. The LED element 300 is a direct type structure disposed on one surface side of the surface light conversion member. In addition, the lower surface of the transparent plate 100 included in the surface light conversion member and the upper surface of the printed circuit board 400 on which the LED element 300 is mounted are in close contact with each other, and the receiving hole 150 is formed in the lower surface of the transparent plate 100. The reflective pattern 130 is processed for the region except for (). In addition, the reflective pattern 130 may be a dot or linear irregular shape, the reflective pattern 140 may be integrally coated on the reflective pattern 130 of the transparent plate 100, the printed circuit The periphery of the substrate 400 may be bent upward to have a frame integrated structure. Therefore, the operation of the invention configuration overlapping with the embodiment of FIG. 3 may be applied in the same manner, and a detailed description thereof will be omitted.

In the embodiment of FIG. 6, the surface light conversion member may include a plate-shaped transparent plate 100 and a plurality of light guide lenses 200. The transparent plate 100 includes a plurality of accommodation holes 150 corresponding to each of the LED elements 300, and each of the plurality of light guide lenses 200 is inserted into and fixed to the accommodation hole 150.

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

At least one of an upper surface and a lower surface of the light guide lens 200 may be provided with a reflective surface that is inclined downwardly, and the reflective surface basically passes a part of the light irradiated from the LED device 300 in the opposite direction, that is, transparent. It serves to reflect back toward the lower surface of the plate (100). Specifically, the reflective surface is formed in the upper surface of the light guide lens 200, the reflecting groove 210 is provided in the reflecting groove 210 is in the form of the first reflecting surface 212 is inclined downward acutely, or the light guide The semi-circular convex portion 221 is formed on the lower surface of the lens 200 and may be provided in the convex portion 221 and may be any one of a second reflective surface 222 inclined downwardly. In the drawing, both the first reflective surface 212 and the second reflective surface 222 are illustrated as being provided.

Referring to FIG. 7, the light emitted to the upper side of the transparent plate 100 may include the direct emitted light through which the light emitted from the LED device 300 passes through the light guide lens 200, and the second reflecting surface 222. Indirectly emitted light due to retroreflection and re-reflection between the reflective patterns 130 and the light guide lens 200 and then retroreflected by the first reflective surface 212 to reflect the upper surface or the reflective pattern of the transparent plate 100. Indirectly emitted light re-reflected by the 130 is mixed light, and as in the embodiment of FIG. 3, a plane image having an overall uniform illuminance by scattering diffusion or mixing effect between the direct and indirectly emitted light. Can be implemented with light.

Meanwhile, in the embodiment of FIG. 7, in addition to the uniform planar light embodying effect, the light reflecting by the scattering effect of the first reflective surface 212 with respect to the direct light emitted directly through the inside of the light guide lens 200 is reflected. Decorative effects can be added. This decorative effect is especially when the upper end of the light guide lens 200 protrudes to the upper surface of the transparent plate 100 so that all or part of the first reflective surface 212 protrudes above the upper surface of the transparent plate 100, or The inclination angle of the first reflective surface 212 surface element may be more prominent by varying the inclination angle such as the crystal surface.

FIG. 8 is a structural diagram of a direct type LED surface lighting apparatus according to a third embodiment of the present invention, and FIG. 9 is a schematic diagram of an optical path in the apparatus.

The apparatus 10 according to FIG. 8, like the apparatus according to FIGS. 3 and 6, is composed of a group of a plurality of LED elements 300 regularly arranged and mounted on a printed circuit board 400 and a surface light switching member. The plurality of LED elements 300 is a direct type structure disposed on one surface side of the surface light conversion member. In addition, the lower surface of the transparent plate 100 included in the surface light conversion member and the upper surface of the printed circuit board 400 on which the LED element 300 is mounted are in close contact with each other, and the receiving groove 120 is formed in the lower surface of the transparent plate 100. The reflective pattern 130 is processed for the region except for (). In addition, the reflective pattern 130 may be a dot or linear irregular shape, the reflective pattern 140 may be integrally coated on the reflective pattern 130 of the transparent plate 100, the printed circuit The periphery of the substrate 400 may be bent upward to have a frame integrated structure. Therefore, the operation of the invention configuration overlapping with the embodiment of FIG. 2 and FIG. 6 may be applied in the same manner, and a detailed description thereof will be omitted.

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

On each of the upper and lower surfaces of the transparent plate 100, as in the embodiment of FIG. 1, the reflective groove 110 and the receiving groove 120 are integrally formed. The reflective groove 110 is concave 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 downward acutely. In addition, the accommodating groove 120 accommodates each of the plurality of LED elements 300, and a protrusion 121 protruding semicircularly toward the LED element 300 is selectively provided on an inner upper surface of the accommodating groove 120. Can be. The protrusion 121 is provided with a second reflective surface 122 inclined downwardly in a curved shape. On the other hand, in the circumferential direction of the transparent plate 100, the reflective groove 110 is provided with a fastening groove 160 to be engaged with the fastening protrusion 260 provided in the light guide lens 220A. In the embodiment of FIG. 8, a process of retroreflection and rereflection between the first reflective surface 112, the second reflective surface 122, and the reflective pattern 130 provided in the transparent plate 110, and accordingly The scattering diffusion to mixing effect of the light is the same as in the embodiment of FIG.

Each of the plurality of light guide lenses 200A includes a convex portion 221A protruding from a lower surface thereof, and is engaged with the fastening groove 160 of the transparent plate 100 in the circumferential direction from the outside of the convex portion 221A. Losing fastening protrusions 260 are provided. In this case, the convex portion 221A is formed to match the shape of the reflecting groove 110 so that the reflection of the light of the LED element 300 can be performed at the same reflecting angle as the first reflecting surface 112. It is preferable. The convex portion 221A is provided with a fourth reflective surface 222A inclined downward. The light guide lens 200A is mounted such that the convex portion 221A corresponds to the reflective groove 110. Meanwhile, the second reflection groove 210A may be selectively provided on the upper surface of the floodlight plate 100, and the second reflection groove 210A may be provided with a third reflective surface 212A that is inclined downward. In the embodiment, both the third reflection surface 212A and the fourth reflection surface 222A are illustrated as being provided.

Referring to FIG. 9, each of the plurality of light guide lenses 200A is mounted such that the convex portion 221A corresponds to the reflective groove 110, and an upper end of the light guide lens 200A is on the upper surface of the transparent plate 100. It is mounted so as to protrude. In this state, the third reflecting surface 212A and the fourth reflecting surface 222A reverse some of the light transmitted from the LED device 300 toward the lower surface of the transparent plate 100 similarly to the embodiment of FIG. 6. By reflecting, the process of retroreflection and re-reflection between the reflective pattern 130 and the scattering diffusion or mixing effect of light is increased. In addition, similar to the embodiment of FIG. 6, a decoration effect that is shiny by the scattering effect of the third reflection surface 212A to the direct exit light emitted directly through the inside of the light guide lens 200A may be added. The decorative effect may be that when all or part of the third reflective surface 212A protrudes beyond the upper surface of the transparent plate 100, or the inclination angle of the third reflective surface 212A surface element varies as the crystal surface. To be more noticeable.

Meanwhile, when comparing the embodiment of FIG. 6 to the embodiment of FIG. 8, in the case of the embodiment of FIG. 6, a part of the light reflected back from the first reflective surface 212 and the second reflective surface 222 of the light guide lens 200 The transparent plate 100 may be blocked by the inner wall of the accommodating hole 150 and may not reach the reflective pattern 130. However, in the embodiment of FIG. 8, the third reflecting surface 212A and the fourth reflecting lens 200A of the light guide lens 200A. Most of the light reflected back from the reflective surface 222A may be directed to the reflective pattern 130. In addition, in the embodiment of FIG. 6, the surface elements related to re-reflection are the first reflection surface 212 and the second reflection surface 222 provided in the light guide lens 200. The first reflecting surface 112 and the second reflecting surface 122 provided in the 100 and the third reflecting surface 212A and the fourth reflecting surface 222A provided in the light guide lens 200A also contribute to re-reflection. do. Accordingly, the embodiment of FIG. 8 may be superior to the embodiment of FIG. 6 in terms of diffusion of uniformed light, formation of uniform illuminance, brightness, and light conversion efficiency.

As described above, the LED surface lighting apparatus according to the present invention has an excellent illuminance uniformity and light switching efficiency while being thin and compact by improving the structure of the transparent plate, the LED element, and the arrangement form as the surface light conversion member. In addition, the LED surface lighting apparatus according to the present invention comprises a light guide lens inserted into the transparent plate and the transparent tube or installed in the transparent plate and the transparent tube, and the above-mentioned through the structure of the transparent plate, the light guide lens and the LED element and arrangement form Along with the effect, the decoration effect on the emitted light can be given at the same time. In addition, the LED surface lighting apparatus according to the present invention, through the improvement of the structure for the surface light conversion member and the PCB structure mounted with the LED element can minimize the component parts to improve the assembly and reduce the cost.

The above description relates to specific embodiments of the present invention. The above embodiments according to the present invention are not to be understood as limiting the scope of the present invention or the matter disclosed for the purpose of description, and those skilled in the art without departing from the spirit of the present invention various changes and modifications 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 engraved in a conical shape and the first reflective surface 112 provided in the reflective groove 110 is straight. However, if the first reflecting surface 112 is provided with a surface element inclined downward to reflect back light incident from the LED device 300 to the lower surface of the transparent plate 100, the reflecting groove 110 and The shape of the first reflecting surface 112 is not particularly limited, and for example, the reflecting groove 110 may be formed in a polygonal or semi-circular shape, and the first reflecting surface 112 may be implemented in a planar and curved form. . In this case, in the embodiment of FIG. 8, the shape of the convex portion 221A of the light guide lens 200A may be modified to match the deformed shape of the reflective groove 110.

2 and 8, the protrusion 121 formed on the inner upper surface of the receiving groove 120 is generally embossed in a semicircle to have a second reflective surface 122 having a curved shape. Even when the protrusion 121 is formed, the second reflective surface 122 includes a surface element inclined downward 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 ramen protrusion 121 and the second reflective surface 122 is not particularly limited, and the second reflective surface 122 may be implemented in a planar and curved shape. In the case where the first reflective surface 112 is provided on the transparent plate 100, the formation of the second reflective surface 122 to the protrusion 121 is optional. In this case, the inner upper surface of the receiving groove 120 may be formed. It may be a shape that is recessed concave in a simple horizontal plane or in the direction of light irradiation.

In addition, in the embodiment of Figure 6, the shape and structure of the reflective groove 210 and the first reflective surface 212 provided on the upper surface of the light guide lens 200 is the shape of the transparent plate 100 in the embodiment of FIG. It may be modified in a similar manner to the modified embodiment of the reflective groove 110 and the first reflective surface 112 provided on the upper surface, the convex portion 221 and the second reflective surface provided on the lower surface of the light guide lens 200 The shape and structure of the 222 may be modified with respect to the protrusion 121 and the second reflective surface 122 which are selectively provided in the bottom receiving groove 120 of the transparent plate 100 in the above-described embodiment of FIG. 32. It can be modified in a similar manner.

6, the formation of either the first reflective surface 212 or the second reflective surface 222 is optional, and when the first reflective surface 212 is not formed, the light guide lens 200 may be formed. The upper surface may be embodied in a simple plane or upward convex or crystal shape according to a desired decoration effect. When the second reflective surface 222 is not formed, the lower surface of the light guide lens 200 may be a simple horizontal surface or a light irradiation direction. It may be a shape recessed concave. In some cases, it is also possible to form a receiving groove corresponding to the receiving groove 120 of the transparent plate 100 of FIG. 3 on the lower surface of the light guide lens 200 of FIG. 6.

In addition, in the embodiment of FIG. 8, the second reflecting groove 210A and the third reflecting surface 212A of the light guiding lens 200A include the reflecting groove 210 and the light guiding lens 200 of the embodiment of FIG. 6. It can be changed in a similar manner to the modification to the first reflecting surface 212, and if the third reflecting surface 212A is not formed, the upper surface of the light guide lens 200A is a simple plane or upward depending on the desired decorative effect It is also possible to implement a convex or crystal shape.

Accordingly, all such modifications and variations can be understood as fall within the scope of the invention as set forth in the claims or their equivalents.

Claims

In the direct type LED surface lighting device comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member,

The surface light conversion member includes a plate-shaped transparent plate,

The transparent plate may include: a plurality of reflective grooves formed corresponding to each of the plurality of LED elements on an upper surface thereof and having a first reflective surface inclined downward; And a plurality of receiving grooves formed at a lower surface to accommodate each of the plurality of LED elements.

Direct LED surface lighting apparatus, characterized in that the reflective pattern is processed for the area of the lower surface of the transparent plate except the receiving groove.
The direct type LED lighting device of claim 1, wherein the first reflecting surface is a planar or curved inclined surface.
The direct type LED of claim 1, wherein a protrusion formed to protrude toward the LED element is provided on an inner upper surface of the receiving groove, and the protrusion is provided with a second reflective surface in a planar or curved shape inclined downward. Surface lighting device.
In the direct type LED surface lighting device comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member,

The surface light conversion member may include a plate-shaped transparent plate having a plurality of accommodation holes; And a plurality of light guide lenses inserted into each of the plurality of accommodating holes to be inserted to secure an accommodating space in which the LED elements are accommodated.

Each of the plurality of light guide lenses has a reflective surface inclined downward on at least one of an upper surface and a lower surface thereof.

Direct LED surface lighting apparatus, characterized in that the reflective pattern is processed for the area except the receiving hole of the lower surface of the transparent plate.
5. The direct type LED lighting device of claim 4, wherein an upper end of the light guide lens is installed to protrude to an upper surface of the transparent plate.
According to claim 4, The upper surface of the light guide lens is provided with a reflecting groove formed corresponding to the LED element, The reflecting surface is provided in the reflecting groove is a first reflecting surface of the planar or curved shape inclined downward Direct type LED surface lighting device, characterized in that.
The lower surface of the light guide lens is provided with a convex portion protruding toward the LED element, and the reflecting surface is provided with the convex portion and is a second reflective surface having a planar or curved shape inclined downward. Direct LED lighting device.
In the direct type LED surface lighting device comprising a surface light switching member and a plurality of LED elements disposed on one surface side of the surface light switching member,

The surface light conversion member may be a plate-shaped transparent plate; And a plurality of light guide lenses mounted on the transparent plate,

The transparent plate may include: a plurality of reflective grooves formed corresponding to each of the plurality of LED elements on an upper surface thereof and having a first reflective surface inclined downward; And a plurality of receiving grooves formed at a lower surface to accommodate each of the plurality of LED elements.

Each of the plurality of light guide lenses has a convex portion protruding to conform to the shape of the reflective groove on its lower surface, and the convex portion is mounted to correspond to the reflective groove, and the upper end of the light guide lens protrudes to the upper surface of the transparent plate. ,

Direct LED surface lighting apparatus, characterized in that the reflective pattern is processed for the area of the lower surface of the transparent plate except the receiving groove.
The direct type LED of claim 8, wherein a protrusion formed to protrude toward the LED element is provided on an inner upper surface of the receiving groove, and the protrusion is provided with a second reflecting surface having a flat or curved shape inclined downward. Surface lighting device.
10. The method of claim 8, wherein the upper surface of the light guide lens is provided with a second reflecting groove formed corresponding to the LED element, the second reflecting groove is provided with a third reflecting surface of the planar or curved shape inclined downward Direct type LED surface lighting device, characterized in that.
The direct type LED lighting device of claim 8, wherein the convex portion is provided with a fourth reflecting surface having a flat or curved shape inclined downward.
The direct type LED lighting device of any one of claims 1 to 11, wherein the reflective pattern has a dotted or linear concave-convex shape.
The direct type LED lighting device according to any one of claims 1 to 11, wherein a reflective ink is integrally coated on the reflective pattern of the transparent plate.
12. The direct type LED lighting device according to any one of claims 1 to 11, wherein the periphery of the printed circuit board on which the LED element is mounted is bent upward to have a frame integrated structure.
The direct type LED lighting device according to any one of claims 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 are in close contact with each other.