KR101725521B1 - Lighting apparatus - Google Patents

Abstract

The present invention relates to a lighting device capable of realizing illumination only by a simple configuration using a plate-like light guide portion having a plurality of reflection grooves and a light source portion for irradiating light to an end face of the light guide portion.
To this end, the lighting apparatus of the present invention comprises a plate-shaped light guide portion; And a light source unit for emitting light to an end surface of the light guide unit, wherein a plurality of reflection grooves are formed on a surface of the light guide unit,

Description

LIGHTING APPARATUS

The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus capable of realizing illumination by a simple configuration using a plate-shaped light guide unit having a plurality of reflection grooves and a light source unit for irradiating light to an end surface of the light guide unit will be.

In general, a display such as an LCD (Liquid Crystal Display) uses a secondary light source (hereinafter referred to as a 'planar light source') that transmits light emitted from a primary light source through a light guide plate, The efficiency of the light source is becoming an important factor that determines the overall performance of the display device.

In general, the efficiency of light in LCD is about 3 ~ 10%, and the parts where light is mainly lost are light guide plate, polarizer and color filter.

Therefore, the display technology is being developed in such a direction as to minimize the loss of light while reducing the manufacturing cost. Particularly, the development of a light guide plate that transmits light effectively to the front side is being actively developed.

On the other hand, since the light transmitted through one surface of the light guide plate is not uniform in luminance at each part of the light-transmitting surface, a diffusion plate is provided on the surface of the light guide plate through which light is transmitted to complement the luminance.

That is, the diffusion plate functions to uniformize the brightness of the display by diffusing and scattering light incident through the light guide plate.

However, when the diffusing plate described above is inevitably used for the uniformity of luminance, there is a problem that it serves as another loss factor of light efficiency.

Patent No. 10-0897872 (registered on May 08, 2009)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems in the prior art, and it is an object of the present invention to provide a lighting device capable of realizing illumination only by a simple configuration using a plate-like light guide portion having a plurality of reflection grooves and a light source portion .

According to an aspect of the present invention, there is provided a lighting apparatus comprising: a plate-shaped light guide; And a light source unit for emitting light to an end surface of the light guide unit, wherein a plurality of reflection grooves are formed on a surface of the light guide unit,

Preferably, the cross-sectional shape of the reflective groove may be triangular or rectangular.

Preferably, the reflective groove may be formed to incline in an advancing direction of light irradiated to an end surface of the light guide portion.

Preferably, the light source unit includes a first light source unit positioned at one end face of the light guide unit and a second light source unit positioned at the other end face of the light guide unit, and the reflection groove is formed at a center of the light guide unit, And the reflective groove located closer to the second light source unit may be formed to be inclined toward the first light source unit side. The reflective groove may be inclined toward the second light source unit.

Preferably, the plurality of reflection grooves may be formed of at least two groups having different formation lengths.

Preferably, the light guiding portion is formed in an arch shape bent toward a side from which the light is emitted with reference to a direction in which the light of the light source portion is irradiated.

Preferably, the reflective groove may be roughened.

Preferably, the depth of the reflective groove is gradually increased from the light source.

Preferably, the light guide portion may be made of a polygonal acrylic resin.

Preferably, the light source unit comprises an LED bar, and a plastic anti-shatter case may be provided on an outer surface of the LED bar to surround the outer surface of the LED bar except for the LED.

Preferably, a lifting rib for preventing surface contact may be formed on the inside of the short-circuit protection case corresponding to the front portion of the LED bar.

According to another aspect of the present invention, there is provided a lighting apparatus comprising: a first light guiding part and a second light guiding part; A first light source unit for emitting light to an end surface of the first light guide unit; And a second light source unit for emitting light to an end surface of the second light guide unit, wherein a surface of the first light guide unit and a surface of the second light guide unit are divided into a plurality of A reflective groove is formed.

Preferably, the cross-sectional shape of the reflective groove may be triangular or rectangular.

Preferably, the reflective groove may be formed to incline in an advancing direction of light irradiated to the end face of the first light guiding portion or the second light guiding portion.

Preferably, the first light source unit is provided in a pair on one end face and the other end face of the first light guide unit, and the reflection groove of the first light guide unit is formed on the center side between the one end face and the other end face of the first light guide unit And the second light guide part is provided in a pair on one end face and the other end face of the second light guide part, and the reflection groove of the second light guide part is formed on one end face of the second light guide part and the other end face of the second light guide part, And may be formed to be inclined toward the center side between the end faces.

Preferably, the plurality of reflection grooves may be formed of at least two groups having different formation lengths.

Preferably, the first light guide portion and the second light guide portion are formed in an arch shape bent toward a side from which the light is emitted, with reference to a direction in which the light from the first light source portion and the second light source portion is irradiated.

Preferably, the reflective groove may be roughened.

Preferably, the depth of the reflective groove is gradually increased from the first light source portion or the second light source portion.

Preferably, the first light guiding portion or the second light guiding portion may be made of a polygonal acrylic resin.

Preferably, the first light source unit and the second light source unit are LED bars, and a plastic anti-shot case may be provided on an outer surface of the LED bar to surround the outer surface of the LED bar except the LED.

Preferably, a lifting rib for preventing surface contact may be formed on the inside of the short-circuit protection case corresponding to the front portion of the LED bar.

The color temperature of the first light source unit may be different from the color temperature of the second light source unit, and the first light source unit and the second light source unit may be individually lighted.

The present invention as described above is advantageous in that a lighting apparatus can be constituted only by a simple structure using a plate-shaped light guide portion having a plurality of reflection grooves and a light source portion for irradiating light to the end face of the light guide portion.

In addition, since the reflection groove is formed so as to incline in an advancing direction of light, there is an advantage that light can be reflected to the surface side through two inclined surfaces in one reflection groove.

Further, since the plurality of light source portions are configured to emit light at one end face and the other end face of the light guide portion, respectively, there is an advantage that the illuminance of the illumination can be increased.

In addition, since the plurality of reflection grooves are formed in at least two groups having different lengths, illumination light of various patterns can be realized.

In addition, since the light guiding portion is formed in an arch shape, the light irradiation angle can be widened and an aesthetically beautiful feeling can be obtained.

In addition, as the reflection groove is subjected to roughness processing, light can be irradiated through the entire surface of the light guide portion through light scattering as well as light having a calm feeling can be realized.

In addition, since the depth of the reflective grooves gradually increases as the distance from the light source unit increases, uniform light intensity can be achieved as a whole.

In addition, since the light guide portion is made of a polygonal acrylic resin, it is possible to realize an illumination light utilizing a peculiar feeling of Korean traditional acrylic.

In addition, it is possible to prevent short-circuiting of the light source unit constituted by the LED through the plastic short-circuiting prevention case, and in particular, it is possible to effectively prevent short-circuiting through the lifting rib formed in the short-

Further, there is an advantage that the light intensity can be further increased by using the first light guiding portion and the second light guiding portion which are plate-shaped facing each other, and the reflection groove pattern of the first light guiding portion and the reflection groove pattern of the second light guiding portion are combined So that the illumination light can be realized in various patterns.

The color temperature of the first light source portion that emits light to the end portion of the first light guide portion and the color temperature of the second light source portion that emits light to the end portion of the second light guide portion are different from each other to illuminate only the first light source portion, There is an advantage in that various color temperatures can be produced as in the case of lighting both the first light source portion and the second light source portion.

1 is a view showing a lighting apparatus according to a first embodiment of the present invention.
2 is a view showing a lighting device according to a second embodiment of the present invention.
3A and 3B are views showing a lighting apparatus according to a third embodiment of the present invention.
4 is a view showing a lighting device according to a fourth embodiment of the present invention.
5 is a view showing a lighting device according to a fifth embodiment of the present invention.
6 is a view showing a lighting apparatus according to a sixth embodiment of the present invention.
7A and 7B are diagrams showing a lighting apparatus according to a seventh embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to an embodiment of the present invention, there is provided a lighting apparatus comprising: a plate-like light guiding part; and a light source part for irradiating light to an end face of the light guiding part, A plurality of reflective grooves are formed.

According to the configuration of the above-described lighting apparatus, the light irradiated to the end surface of the light guide portion in the light source portion is reflected by the reflection groove, and is emitted to the surface side of the light guide portion so as to be used as illumination.

Hereinafter, various embodiments of the above-described lighting apparatus will be described in detail.

≪ Embodiment 1 >

1, the lighting apparatus according to the first embodiment of the present invention includes a plate-like light guiding portion 100 and light source portions 200A and 200B for irradiating light to an end face of the light guiding portion 100 .

On the other hand, a plurality of reflection grooves 100h are formed on the surface of the light guiding portion 100 to reflect the light radiated on the end surface toward the surface and emit the light.

Specifically, the cross-sectional shape of the reflection groove 100h may be formed in a triangular shape, and the surface of the reflection groove 100h may be subjected to a roughing treatment (r) in order to improve the light diffusion efficiency.

The light source units 200A and 200B include a first light source unit 200A positioned at the left end face of the light guide unit 100 and a second light source unit 200B positioned at the right end face of the light guide unit 100 And each of the light sources 200A and 200B may be an LED bar extending in the longitudinal direction of the light guide 100.

The LED bar may be installed inside the end frame 300 coupled to surround the end of the light guide 100.

In this case, a plastic anti-shatter case 400 may be provided on the outer side of the LED bar to surround the outer surface of the LED bar except for the LED L. In particular, the anti- The lifting rib 410 may be formed on the inner side of the short-circuit prevention case 400 corresponding to the front surface of the LED (L).

It is possible to prevent the circuit part provided on the front portion of the LED bar from being in electrical contact with the end frame 300 by the short prevention case 400 as described above, It is possible to prevent the inner surface of the short-circuit prevention case 400 from being in close contact with the circuit portion of the LED (L) bar as a whole, thereby preventing the circuit portion from being damaged.

1, the light emitted from the first light source unit 200A and the second light source unit 200B to the both end faces of the light guide unit 100, respectively, Is reflected and scattered by the reflection groove (100h) and is emitted toward the upper surface of the light guide portion (100), and a plurality of stripe-shaped striking illumination light corresponding to the shape of the plurality of reflection grooves (100h) .

A part of the light reflected and scattered by the reflective groove 100h may be emitted toward the lower surface of the light guide 100 so that light is emitted through the upper and lower portions of the light guide 100, And the upper and lower sides of the light guide unit 100 may be utilized as illumination.

≪ Embodiment 2 >

As shown in FIG. 2, the lighting apparatus according to the second embodiment of the present invention has a cross-sectional shape of the reflective groove 100h in the width direction of the light guide unit 100 2) in the longitudinal direction (i.e., the longitudinal direction of FIG. 2).

According to the lighting apparatus of the second embodiment as described above, the light emitted from the first light source unit 200A and the second light source unit 200B on both end faces of the light guide unit 100 is emitted to the reflective groove 100h And is emitted toward the upper surface of the light guiding portion 100. The illumination light having a plurality of stripe shapes corresponding to the shapes of the plurality of rectangular reflection grooves 100h can be realized.

A part of the light reflected and scattered by the reflective groove 100h may be emitted toward the lower surface of the light guide 100 so that light is emitted through the upper and lower portions of the light guide 100, And the upper and lower sides of the light guide unit 100 may be utilized as illumination.

≪ Third Embodiment >

As shown in FIGS. 3A and 3B, in the lighting apparatus according to the third embodiment of the present invention, the sectional shape of the reflection groove 100h is triangular when compared with the lighting apparatus of the first embodiment, Is formed so as to be inclined obliquely in the traveling direction of the light irradiated to the end face of the light guide portion 100. [

Specifically, the reflection groove 100h adjacent to the first light source 200A is formed to be inclined obliquely toward the center, and the reflection groove 100h adjacent to the second light source 200B is also inclined toward the center, The reflection groove 100h on one side and the reflection groove 100h on the other side may be formed symmetrically with respect to the center.

According to the lighting apparatus of the third embodiment as described above, the light emitted from the first light source unit 200A and the second light source unit 200B, which are respectively irradiated to both end faces of the light guide unit 100, And is emitted toward the upper surface of the light guiding portion 100. Thus, a plurality of stripe-shaped illumination light corresponding to the shape of the plurality of reflective grooves 100h on the triangle can be realized.

Particularly, in the illuminator of the third embodiment, the light is mainly reflected at both side portions of the triangle, and is emitted in the form of overlapping toward the surface side of the light guide portion 100. Accordingly, .

<Fourth Embodiment>

As shown in Fig. 4, the illuminating device according to the fourth embodiment of the present invention differs from the illuminating device of the first embodiment in that the sectional shape of the reflecting groove 100h is irradiated to the end face of the light guiding portion 100 And are formed in the shape of a parallelogram that is inclined obliquely in the traveling direction of light.

Specifically, the reflection groove 100h adjacent to the first light source 200A is formed to be inclined obliquely toward the center, and the reflection groove 100h adjacent to the second light source 200B is also inclined toward the center, The reflection groove 100h on one side and the reflection groove 100h on the other side may be formed symmetrically with respect to the center.

According to the lighting apparatus of the fourth embodiment as described above, the light emitted from the first light source unit 200A and the second light source unit 200B to both end faces of the light guide unit 100 is reflected by the reflection groove 100h And is emitted toward the upper surface of the light guiding portion 100 to realize a plurality of stripe-shaped illumination lights corresponding to the shapes of the plurality of reflective grooves 100h of the parallelogram.

Particularly, in the illuminator of the fourth embodiment, light is mainly reflected from both long side portions of the parallelogram, and is output in the form of overlapping toward the surface side of the light guide portion 100, so that the illumination light Can be implemented.

<Fifth Embodiment>

5, the light guide 100 may be formed to have a small overall thickness, the cross-sectional shape of the reflection groove 100h may be the same as that of the light guide 100, The light guide portion 100 is formed in an arch shape, the plurality of reflection grooves 100h are formed in a shape of a rectangle having a long length in the longitudinal direction (the transverse direction in FIG. 5) It is characterized by the fact that it consists of two or more groups.

According to the lighting apparatus of the fifth embodiment as described above, the light emitted from the first light source unit 200A and the second light source unit 200B, which are respectively irradiated to both end faces of the light guide unit 100, 100h and is emitted toward the upper surface of the light guide unit 100. The illumination light of a plurality of stripe shapes corresponding to the shape of the plurality of rectangular reflection grooves 100h can be realized.

Particularly, the illuminator of the fifth embodiment has the first reflective groove group 100h-1 of short length, the second reflective groove group 100h-2 of intermediate length, and the third reflective groove group 100h-3 of long length, The illuminating light of a specific pattern shape can be provided unlike a case where straight lines are arranged in parallel.

For example, the length of the reflective grooves may be variously set so that a specific design, a character, or the like can be expressed by the illumination light.

Further, since the light guiding portion 100 is formed into an arch shape bent toward the side where the light is emitted with reference to the direction of the light of the light source portions 200A and 200B, the light guiding angle of the upward directed light can be broadened .

<Sixth Embodiment>

As shown in FIG. 6, the illuminating device according to the sixth embodiment of the present invention has a triangular cross-sectional shape of a reflecting groove 100h as compared with the illuminating device of the first embodiment, Is formed so that the depth of the reflective groove (100h) is gradually increased as the distance from the first light source part (200A) and the second light source part (200B) increases, and the light guide part (100) .

According to the lighting apparatus of the sixth embodiment as described above, the light emitted from the first light source unit 200A and the second light source unit 200B on both end faces of the light guide unit 100 is reflected by the reflection groove 100h And is emitted toward the upper surface of the light guiding portion 100. Thus, a plurality of stripe-shaped illumination light corresponding to the shape of the plurality of reflective grooves 100h on the triangle can be realized.

Particularly, in the lighting apparatus of the sixth embodiment, the depth of the reflective groove 100h is gradually increased as the distance from the first light source unit 200A and the second light source unit 200B increases, so that the first light source unit 200A, And the second light source unit 200B, and it is possible to further diffuse and distribute the light in the pattern inherent in Korean traditional acrylic through the Korean traditional acrylic, Thereby providing a bright illumination.

<Seventh Embodiment>

As shown in FIGS. 7A and 7B, the lighting apparatus according to the seventh embodiment of the present invention includes a plate-shaped first light guiding portion 100A and a second light guiding portion 100B, A first light source unit 200A-1 and a second light source unit 200B-1 for irradiating light to an end face of the second light guide unit 100B, , And 200B-2.

A plurality of reflective grooves 100h are formed on the surfaces of the first light guide portion 100A and the second light guide portion 100B to reflect the light radiated in the end face toward at least one side surface and emit the light.

For example, the reflection grooves 100h of the first light guiding portion 100A may be formed to extend along the transverse direction, and the reflection grooves 100h of the second light guiding portion 100B may be formed of the first light guiding And may extend in the vertical direction so as to be perpendicular to the direction of the reflection groove 100h of the portion 100A.

The cross-sectional shape of the reflection groove 100h may be formed in a rectangular shape, and the surface of the reflection groove 100h may be subjected to a roughing process (r) in order to improve the light diffusion efficiency.

It is a matter of course that the cross-sectional shape of the reflective groove 100h can be variously modified in consideration of the reflection efficiency of light by a triangle, an inclined triangle, a parallelogram, or the like.

The first light source unit 200A includes a first A light source unit 200A-1 located at one end face of the first light guide unit 100A and a first B light source unit 200A located at the other end face of the first light guide unit 100A. And the second light source unit 200B may include a second light source unit 200B-1 located at one end face of the second light guide unit 100B and the second light guide unit 100B, And a second B light source unit 200B-2 located on the other end surface of the second B light source unit 200B-2.

The first A light source unit 200A-1, the first B light source unit 200A-2, the second A light source unit 200B-1, and the second B light source unit 200B-2 may include the first light guide unit 100A, The LED 100 may be formed as a long LED extending along the longitudinal direction of the cross section of the portion 100B.

The LED bar may be installed inside the end frame 300 coupled to surround the ends of the first light guiding part 100A or the second light guiding part 100B.

In this case, a plastic anti-shatter case 400 may be provided on the outer side of the LED bar to surround the outer surface of the LED bar except for the LED L. In particular, the anti- The lifting rib 410 may be formed on the inner side of the short-circuit prevention case 400 corresponding to the front surface of the LED (L).

It is possible to prevent the circuit part provided on the front portion of the LED bar from being in electrical contact with the end frame 300 by the short prevention case 400 as described above, It is possible to prevent the inner surface of the short prevention case 400 from entirely contacting the circuit portion of the LED (L) bar, thereby preventing the circuit portion from being damaged.

According to the lighting apparatus of the seventh embodiment as described above, as shown in FIG. 7, light irradiated to both end faces of the first light guide unit 100A from the first light source unit 200A, The light emitted from the first light guiding portion 100A and the second light guiding portion 100B are reflected and scattered by the reflective grooves 100h, And is emitted toward the upper surface, and as shown in FIG. 7A, it is possible to realize illumination light in the form of a lattice pattern on a plane, thereby enabling illumination with sufficient illumination.

A part of the light reflected and scattered by the reflection groove 100h may be emitted toward the lower surface of the first light guide portion 100A and the second light guide portion 100B, Both the upper and lower portions of the first light guiding portion 100A and the second light guiding portion 100B may be irradiated with light to utilize the upper and lower sides of the lighting device as illumination.

The first light guiding portion 100A and the second light guiding portion 100B may be formed in an arch shape as in the lighting device of the fifth embodiment, or the plurality of reflective grooves 100h may be formed in at least two or more It is needless to say that the first light guiding portion 100A and the second light guiding portion 100B may be made of polygonal acrylic.

In addition, as in the lighting apparatus of the sixth embodiment, the reflective groove 100h is formed such that the depth of the reflective groove 100h gradually increases as the distance from the first light source unit 200A or the second light source 200B increases Of course.

The color temperature of the first light source unit 200A may be different from that of the second light source unit 200B. For example, the first light source unit 200A may have a color temperature of 6500K, The two light source unit 200B may be configured to have a color temperature of 4000K and the first light source unit 200A and the second light source unit 200B may be individually turned on to realize various color temperatures.

That is, only the first light source unit 200A is turned on, only the second light source unit 200B is turned on, or various color temperatures can be produced as the first light source unit 200A and the second light source unit 200B are both turned on.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

100: light-
100h: reflective groove
200A, 200B: Light source unit
300: end frame

Claims (23)

A plate-shaped light guide portion; And
And a light source unit for emitting light to an end surface of the light guide unit,
Wherein a plurality of reflection grooves are formed on the surface of the light guiding portion,
Wherein the light source unit includes a first light source unit located at one end face of the light guide unit and a second light source unit positioned at the other end face of the light guide unit,
Wherein a reflection groove located closer to the first light source unit with respect to a center of the light guide unit is formed to incline obliquely toward the second light source unit side and a reflection groove located close to the second light source unit side, And is inclined obliquely toward the front side. The method according to claim 1,
Wherein the cross-sectional shape of the reflection groove is triangular or square. delete delete The method according to claim 1,
Wherein the plurality of reflective grooves are formed of at least two groups having different formation lengths. The method according to claim 1,
The light guiding portion includes:
Wherein the light guide member is formed in an arch shape bent toward a side from which the light is emitted based on a direction in which the light of the light source unit is irradiated. The method according to claim 1,
Wherein the reflective groove is roughened. The method according to claim 1,
And the depth of the reflective groove is gradually increased as the distance from the light source unit increases. The method according to claim 1,
Wherein the light guiding portion is made of Korean paper acrylic. The method according to claim 1,
Wherein the light source unit comprises an LED bar, and a plastic anti-shot case is provided on an outer surface of the LED bar to surround the outer surface of the LED bar except for the LED. 11. The method of claim 10,
And a lifting rib is formed on the inside of the short-circuit preventing case corresponding to the front portion of the LED bar to prevent surface contact. A first light guiding portion and a second light guiding portion which are plate-shaped and face each other;
A first light source unit for emitting light to an end surface of the first light guide unit; And
And a second light source unit for emitting light to an end surface of the second light guide unit,
Wherein a plurality of reflection grooves are formed on the surfaces of the first light guiding portion and the second light guiding portion to reflect light radiated in a cross section toward at least one surface side and emit the light,
Wherein the first light guide part is provided in a pair at one end face and the other end face of the first light guide part, and the reflection groove of the first light guide part is directed toward the center side between one end face and the other end face of the first light guide part And is inclined,
Wherein the second light guide part is provided in a pair on one end face and the other end face of the second light guide part, and the reflection groove of the second light guide part is directed toward the center side between one end face and the other end face of the second light guide part And is inclined. 13. The method of claim 12,
Wherein the cross-sectional shape of the reflection groove is triangular or square. delete delete 13. The method of claim 12,
Wherein the plurality of reflective grooves are formed of at least two groups having different formation lengths. 13. The method of claim 12,
Wherein the first light guiding portion and the second light guiding portion comprise:
Wherein the first light source unit and the second light source unit are formed in an arcuate shape bent toward a side from which the light is emitted based on a direction in which light from the first light source unit and the second light source unit is emitted. 13. The method of claim 12,
Wherein the reflective groove is roughened. 13. The method of claim 12,
And the depth of the reflective groove is gradually increased as the distance from the first light source portion or the second light source portion increases. 13. The method of claim 12,
Wherein the first light guiding portion or the second light guiding portion is made of Korean paper acrylic. 13. The method of claim 12,
Wherein the first light source unit and the second light source unit are formed of LEDs, and the exterior of the LED bars is provided with a plastic anti-shatter case for enclosing the outer surface of the LED bars except the LEDs. 22. The method of claim 21,
And a lifting rib is formed on the inside of the short-circuit preventing case corresponding to the front portion of the LED bar to prevent surface contact. 13. The method of claim 12,
Wherein the color temperature of the first light source unit and the color temperature of the second light source unit are different from each other, and the first light source unit and the second light source unit are individually lighted.

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