KR20170129520A - Decorative lens and direct-type led planar lighting device provided with the same - Google Patents

Abstract

The present invention relates to a decorative lens, and a direct type light emitting diode (LED) surface lighting device having the same. The direct type LED surface lighting device of the present invention comprises a surface light conversion member, and a plurality of LED devices disposed on one surface side of the surface light conversion member. The surface light conversion member is formed with a planar transparent plate. The transparent plate includes: a plurality of reflective grooves formed to correspond to each of the LED devices on an upper surface thereof, and having a first reflective surface formed with an inclined surface having a flat or curved shape inclined downward; and a plurality of accommodation grooves formed on a lower surface thereof, and accommodating each of the LED devices. A dot-shaped or linear reflection pattern is processed with respect to a region except the accommodation grooves on the lower surface of the transparent plate. A plurality of decorative lenses attachable to and detachable from the transparent plate are provided in a direct direction of each of the LED devices, and an exit surface side of each of the decorative lenses is formed with a bell-shaped concave cross-sectional profile having a tapered peak at the center thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a decorative lens and a direct-

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 conventional direct-type LED surface illuminator 1 has a relatively simple structure and can be easily assembled at low cost, but has a high light conversion efficiency. However, the number of components is still large. In addition, the direct-type LED surface illuminator 1 has a problem that loss of light quantity due to beads in the diffusion plate 2 is inevitable, and that the distance between the LED element 3 as the point light source and the diffusion plate 2, Accordingly, there is a large deviation from the uniformity of the emitted light. That is, when the distance between the diffusion plate 2 and the LED element 3 is increased, the luminance uniformity can be improved, but it is difficult to manufacture thin and the light conversion efficiency is relatively low. On the other hand, if the distance between the diffusion plate 2 and the LED element 3 is small, even if the LED light is emitted through the diffusion plate 2, the emission uniformity is excessively hindered by forming outgoing light having locally high irradiation intensity . In addition, it is difficult for the conventional direct-type LED surface illuminator 1 to suppress the deterioration of the appearance of the illumination on the surface of the diffuser plate 2, which is the final emitting surface, due to the local LED direct emission light which is increased during thin manufacturing.

An object of the present invention is to provide a direct-type LED surface illuminator having improved illumination uniformity and light conversion efficiency while improving the appearance of illumination on the final exit surface while reducing the thickness and size of the apparatus.

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, Reflecting part of the irradiated light is reversely reflected and retroreflected in the opposite direction through a structural improvement to the transparent plate itself as a surface light changing member to induce emitted light even outside the area where the LED device is disposed, In order to improve the appearance of the illumination on the final exit surface, it is necessary to provide a means for separately controlling the directly irradiated light from each of the plurality of LED elements as the transparent By knowing the way to attach detachable decorative lenses to the plate, and by further refining the relevant mechanical design The present invention has been reached. 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 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- A plurality of reflective grooves provided on the upper surface of the substrate, the first reflective surface being formed in a plane or curved surface inclined downwardly corresponding to each of the plurality of LED elements; And a plurality of receiving grooves formed in the lower surface of the transparent plate and accommodating the plurality of LED elements, wherein a dotted or linear reflection pattern is formed on the lower surface of the transparent plate except for the receiving groove, And a plurality of decorative lenses detachably attachable to the transparent plate along a direction directly below each of the elements, wherein the exit surface side of each of the plurality of decorative lenses is formed as a bell-shaped concave sectional profile having a sharp peak at the center Wherein the light emitting device is a direct-type LED surface lighting device.

(2) In the inner upper surface of the receiving groove, a protruding portion protruding toward the LED element is provided, and a second reflective surface of a flat or curved shape inclined downward is provided on the protruding portion. Type LED surface lighting device.

(3) The direct under-type LED surface illuminator of (1), wherein the reflection ink is integrally coated with the reflection pattern.

(4) The direct-type LED surface illuminator according to any one of (1) to (3), wherein the concave cross-sectional profile 210 is a curved surface shape having two inflection points with the peak as a central peak.

(5) The direct-type LED surface illuminator according to any one of (1) to (3), wherein each of the plurality of decorative lenses is divided into a plurality of parts.

(6) Each of the plurality of decorative lenses includes a diffusion portion including the concave sectional profile, a base portion mounted on the transparent plate, and at least one extension portion coupled between the diffusion portion and the base portion. (5).

(7) The direct-type LED surface illuminator according to any one of (1) to (3), wherein each side of each of the plurality of decorative lenses has a polygonal shape.

(8) The decorating lens is provided with a fastening protrusion at the periphery of the bottom surface thereof, and a fastening groove is formed at the periphery of the reflecting groove of the transparent plate, and the fastening protrusion and the fastening groove are detachably coupled to each other in such a manner as to be engaged with each other. The direct-type LED surface illuminator according to any one of (1) to (3) above.

(9) The direct-type LED surface illuminator according to any one of (1) to (3), wherein each of the plurality of decorative lenses is provided with a convex portion formed on the bottom surface thereof so as to conform to the shape of the reflection groove.

(10) A decorative lens detachably attached to a transparent plate included in a direct-type LED surface light source device including a plurality of LED elements, the decorative lens being mounted along a direction directly below each of the plurality of LED elements, Sectional profile having a bell-shaped concave cross-sectional profile.

(11) The apparatus as set forth in any one of (10) to (10) above, further comprising a diffusion section including the concave sectional profile, a base section mounted on the transparent plate, and at least one extension section coupled between the diffusion section and the base section lens.

(10) or (11), wherein a side surface of the lens (12) has a polygonal shape.

(10) or (11), characterized in that a convex portion is provided on a lower surface of the lens (13).

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 diverting member to provide a thin and small size with excellent luminance uniformity and light conversion efficiency, Accordingly, a decorative lens detachably attachable to the transparent plate is added to each of the plurality of LED elements to individually control the direct light emitted from the LED element, thereby improving the appearance of illumination on the final light exit surface and imparting various decorative effects such as a chandelier can do. 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 illuminator according to the related art.
2 is an exploded perspective view of a direct-type LED surface illuminator according to an 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.
5 is a vertical sectional view and a plan view of a decorative lens according to the embodiment of FIG.
6 is a longitudinal sectional view of a decorative lens according to another embodiment of the present invention.
7 is a photograph of a product of a decorative lens according to an embodiment of the present invention.

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 illuminator (hereinafter abbreviated as "apparatus") according to an embodiment of the present invention, FIG. 3 shows a structural diagram of a direct- Shows a schematic diagram of the optical path shown by enlarging part A in the above apparatus. 5 is a vertical sectional view and a plan view of a decorative lens added to the apparatus.

The device 10 comprises a group of a plurality of LED devices 300 arranged in a regular array on a printed circuit board 400 and a surface light switching member, 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. The apparatus 10 further includes a plurality of decorative lenses 200 mounted on the surface light diverting member and detachably attached to the plurality of LED elements 300 along the downward direction.

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.

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 are coupled to each other by using an adhesive such as epoxy (not shown) between the lower surface of the printed circuit board 400 and the upper surface of the transparent plate 100 And may be a structure that is fastened with a bolt or the like although not shown in the drawings.

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.

Meanwhile, the decorative lens 200 shown in FIG. 5 serves to separately control direct light from each of the plurality of LED elements, and is detachably provided on the upper surface of the transparent plate 100. In this case, a plurality of the decorative lenses 200 are provided, and each of the decorative lenses 200 is mounted corresponding to each of the plurality of reflective grooves 110 of the transparent plate 100.

4 and 5, the exit surface side of the decorative lens 200 is formed as a bell-shaped concave sectional profile 210 having a sharp peak P at the center thereof. The concave cross-sectional profile 210 may be formed by rotating the cross-sectional profile 210 with a virtual rotation axis passing through the peak P. The peak P serves to suppress the local illumination concentration in the direction directly below the LED by minimizing the directivity of the emitted light from the LED. The concave section profile 210 has a curved surface shape having two inflection points IP1 and IP2 outward with the peak P as a center vertex. The concave section profile 210 thus has a first region extending from the peak P to the first inflection point IP1 and a second region extending from the first inflection point IP1 to the second inflection point IP2 A second region, and a third region extending from the second inflection point IP2 to the boundary. The curved surface of the concave section profile 210 corresponding to the first region and the third region diffuses and reflects at a relatively acute angle relative to the LED linearly emitted light because the inclination is relatively large and the concave sectional profile corresponding to the second region 210 are diffused and reflected at a relatively obtuse angle relative to the LED straight-ahead emitted light because the inclination is relatively gentle. Accordingly, the LED emission light diffused and scattered through the decorative lens 200 can be visually ensured in a wide viewing angle, thus realizing a good decoration effect.

Referring to the top view of the decorative lens 200 of FIG. 5, the side of the decorative lens may be provided in a polygonal shape to add a glare at the corner portion, and the concave sectional profile 210, visible through each side, It is possible to double the beautiful decoration effect.

Each of the plurality of decorative lenses 200 is detachably provided to the transparent plate 100. For this purpose, referring to FIGS. 2 and 5, each decorative lens 200 has a fastening protrusion 260 And the fastening protrusion 260 is engaged with the fastening groove 160 provided in the peripheral edge of the reflective groove 110 of the transparent plate 100. The fastening protrusion 260 and the fastening groove 160 as the fastening elements can be shielded from being hindered by the outgoing light since the decorative lens 200 is concealed in the state of being coupled to the transparent plate 100. [ As the fastening elements, the fastening protrusions 260 may be provided in a spaced-apart shape at regular intervals along the circumference of the bottom surface of the decorative lens 200, but they may be formed in a continuous shape, May be provided in discontinuous or continuous form. Further, in connection with the fastening and detachment of the decorative lens 200, a method of forming a flange at the lower edge of the decorative lens 200 and bolting the flange to the transparent plate in addition to the interference fit method according to the illustrated embodiment It is also possible to do.

Each of the plurality of decorative lenses 200 is provided with a convex portion 221 protruding from the bottom surface thereof. In this case, the convex portion 221 is formed to conform to the shape of the reflection groove 110 so as to perform retroreflection with respect to light of the LED element 300 at the same reflection angle as the first reflection surface 112 . The convex portion 221 is provided with a third reflecting surface 222 which is inclined at an acute angle downward. The decorative lens 200 is mounted so that the convex portion 221 corresponds to the reflective groove 110. The third reflective surface 222 reflects a part of the transmitted light of the LED element 300 toward the lower surface of the transparent plate 100 so that the reflected light is reflected and reflexed Thereby increasing scattering diffusion or mixing effect of the light.

6 is a sectional view of a decorative lens 200 according to another embodiment of the present invention. The decorative lens 200 according to the embodiment of FIG. 6 is characterized in that the constituent parts are separately provided. For example, as shown in the drawing, each part of the decorative lens 200 includes a diffusion part 230 including the vertical concave sectional profile 210, a base part 220 mounted on the transparent plate 100, And an extension part 240 coupled between the diffusion part 230 and the base part 220. The length of the decorative lens 200 mounted on the transparent plate 100 protruding outside the transparent plate 100 can be varied by the divided structure of the decorative lens 200. For example, the decorative lens 200 may be constituted by only the diffusion portion 230 and the base portion 220 and may be configured to be short, or may be configured to be elongated with one or more extended portions 240 interposed therebetween, It is possible to provide a decorative effect, and it is not necessary to separately manufacture the decorative lens 200 of a predetermined length, thereby reducing the manufacturing cost.

6, the diffusion unit 230, the base unit 220, and the extension unit 240 constituting the decorative lens 200 can be coupled in a detachable manner so as to be detachable from each other, An adhesive may be used. 6, a fastening protrusion 260 for engaging with the fastening groove 160 of the transparent plate 100 is formed at the peripheral edge of the lower surface of the base portion 130.

7 shows a photograph of a product of a device 10 provided with decorative jellies 200 according to the present invention. The device 10 can be manufactured in a thin shape with only the frame-integrated printed circuit board 400 and the transparent plate 100 minimized in component construction and can be installed in close contact with the ceiling surface. In this case, the transparent plate 100 And a bolt passing through a predetermined area of the printed circuit board 400. [ Although the planar light emitted from the device 10 in the lighted state is made thin, it has a high luminance and a uniform emission quality. In order to form a uniform illuminance in the conventional direct type LED surface illuminator (1 in FIG. 1) It is possible to effectively solve the problem that the volume of the device becomes large as the device is inevitably manufactured in a rear form, the outer appearance becomes coarse, and the light conversion efficiency and luminance are lowered. In addition, the bezel area can be minimized at the edge of the exit surface of the transparent plate 100, thereby maximizing the interior decoration effect. Particularly, the LED direct emission light emitted from the emitting surface corresponding to the region directly below the LED element, which is increased by the decorative lens 200, is diffused and scattered by the decorative lens 200, Thereby improving the appearance of the illumination on the surface of the display device 100 and giving a sparkling decorative effect such as a chandelier. The decorative lens 200 is not particularly limited as long as it is a light transmissive material. In order to enhance diffusion and scattering effect of the decorative lens 200, diffusion particles (not shown) such as beads may be contained in the decorative lens 200, The color may be given in the manufacturing process.

As described above, the LED surface illuminating device with the decorative lens according to the present invention is improved in the structure of the transparent plate 100 as the surface light switching member and the arrangement of the LED element 300 and the arrangement thereof to provide a thin and compact, And a decorative lens 200 detachably attachable to the transparent plate 100 along the direction directly under the LED element 300 is added to each of the plurality of LED elements 300 so as to form the LED element 300, It is possible to improve the appearance of illumination on the surface of the transparent plate 100 which is the final exit surface and to give a decorative effect such as a chandelier at the same time. The LED surface illuminator 10 according to the present invention can improve the structure of the transparent plate 100 as the surface light switching member and the structure of the printed circuit board 400 on which the LED element 300 is mounted, Thereby minimizing the manufacturing cost and improving the assemblability.

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 FIG. 2, 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, If the first reflective 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 slopes 112 is not particularly limited. For example, the reflection grooves 110 may be polygonal pyramids or semicircles. The first reflection surfaces 112 may be planar and curved.

2, the protrusion 121 formed on the inner upper surface of the receiving groove 120 is generally semicircularly embossed and has a curved second reflecting surface 122. However, the protrusion 121 The second reflective surface 122 is provided with a downward inclined surface element so that light incident from the LED element 300 can be reflected back to the lower surface of the transparent plate 110, The shape of the second reflective surface 121 and the second reflective surface 122 is not particularly limited, and the second reflective 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.

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: Decorative Lens
210: concave cross-sectional profile of bell shape
220: base portion 221: convex portion
222: third reflecting surface 230: diffusing portion
221: convex portion 240:
260: fastening protrusion 300: LED element
400: printed circuit board 410: metal layer
420: resin layer
P: Peak
IP1, IP2: inflection point

Claims (13)

And a plurality of LED elements arranged on one surface side of the surface light diverting member,
Wherein the surface light switching member is made of a plate-shaped transparent plate,
Wherein the transparent plate comprises: a plurality of reflective grooves provided on the upper surface thereof with a first reflective surface formed corresponding to each of the plurality of LED elements, the inclined surface being a plane or curved surface inclined downward; And a plurality of receiving grooves formed in the lower surface and accommodating the plurality of LED elements,
A pointed or linear reflection pattern is formed on the lower surface of the transparent plate with respect to an area excluding the receiving groove,
And a plurality of decorative lenses detachably attachable to the transparent plate along a downward direction of each of the plurality of LED elements, wherein the exit surface side of each of the plurality of decorative lenses has a concave section profile of a bell- Wherein the light emitting surface of the direct LED-type side surface illuminating device is formed of a transparent material. The LED according to claim 1, wherein a protruding portion protruding toward the LED element is provided on an inner upper surface of the receiving groove, and a second reflecting surface is formed on the protruding portion in a downwardly inclined plane or curved shape. Surface illuminator. The direct-type LED surface illuminator according to claim 1, wherein the reflection ink is integrally coated on the reflection pattern. 4. The direct-type LED surface illuminator according to any one of claims 1 to 3, wherein the concave sectional profile 210 is a curved surface shape having two inflection points with the peak as a central peak. The direct-type LED surface illuminator according to any one of claims 1 to 3, wherein each of the plurality of decorative lenses is divided into a plurality of parts. 6. The apparatus of claim 5, wherein each of the plurality of decorative lenses comprises a diffuser including the concave cross-sectional profile, a base mounted to the transparent plate, and at least one extension coupled between the diffuser and the base. Wherein the light emitting device is a direct-type LED surface light device. The direct-type LED surface illuminator according to any one of claims 1 to 3, wherein the side surfaces of each of the plurality of decorative lenses are formed in a polygonal shape. The decorative lens according to any one of claims 1 to 3, wherein the decorating lens is provided with a fastening protrusion at the bottom edge of the decorative lens, and a fastening groove is provided at the periphery of the reflective groove of the transparent plate, Wherein the light emitting diode is mounted in a detachable manner. The direct-type LED surface illuminator according to any one of claims 1 to 3, wherein each of the plurality of decorative lenses is provided with a convex portion protruding from the bottom surface thereof to conform to the shape of the reflection groove. A decorative lens detachably attached to a transparent plate included in a direct-type LED surface light source device including a plurality of LED elements, the decorative lens being mounted along a direction directly below each of the plurality of LED elements, the emission surface side having a sharp peak at the center Sectional profile of a bell-shaped bell-shaped cross-section profile. 11. The decorative lens of claim 10, further comprising: a diffusion section including the concave sectional profile; a base section mounted on the transparent plate; and at least one extension section coupled between the diffusion section and the base section. 12. The decorative lens according to claim 10 or 11, characterized in that the side surface has a polygonal shape. 12. The decorative lens according to claim 10 or 11, characterized in that a convex portion is provided on the lower surface.

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