KR20090116991A - Illuminating apparatus - Google Patents

Abstract

PURPOSE: A lighting device is provided to improve luminance of a light emitted from a light source part by arranging a diffusion sheet between an optical sheet and a supporting member. CONSTITUTION: A lighting device(100) includes at least one connecting part(110), at least one light source part(120), and a light pipe(130). The connecting part is connected to an external power supply unit. The light source part emits a light by using a power applied from the connecting part. The light source part includes an LED. The light pipe transmits and distributes the light emitted from the light source part. The light pipe includes an optical film and a supporting member. A first surface of the optical film has a prism shape. The supporting member is arranged outside the optical film in order to support the optical film.

Description

Lighting apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly, to a lighting device which can be used in place of a fluorescent lamp and which can obtain improved illuminance and uniform brightness.

Fluorescent lamps, incandescent lamps, and three-wavelength bulbs are used as general home lighting devices. Fluorescent lamps refer to hot cathode low-pressure mercury arc discharge lamps containing a small amount of mercury and argon gas of about 5 mmHg to 6 mmHg. It is tubular and has a pair of electrodes sealed at both ends with tungsten-coated electron emitting material.

Fluorescent lamps illuminate by converting the ultraviolet rays generated by the discharge of mercury vapor into visible light on the phosphor coated on the inner wall of the tube.

However, although fluorescent lamps have the advantage of high illumination and high power efficiency, the fluorescent lights are driven using the frequency of commercial AC power supplied to homes, so the quality of light is not soft and glare is generated, and the illuminance of emitted light is reduced. .

Therefore, in order to replace and use the above-described fluorescent lamps, it may be necessary to use a lighting device using a light guide.

Accordingly, an object of the present invention is to provide a lighting device that can be used in place of a fluorescent lamp, and to obtain improved illuminance and uniform brightness.

Lighting device according to the present invention for achieving the above object, at least one connection portion connected to the external power supply means for applying power, and at least one light source unit for generating light using the power applied through the connection portion And an optical pipe for transmitting and distributing light generated by the light source unit, wherein the optical pipe includes an optical film and a supporting member disposed outside the optical film.

The lighting apparatus according to the present invention can be used by replacing the fluorescent light with a light source unit for generating light and an illumination device including an optical guide, it is possible to provide an illumination device that can obtain improved illuminance and uniform brightness.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1A and 1B are views showing a part of an optical film to explain the transmission and reflection of light in an illumination device according to an embodiment of the present invention.

FIG. 1A is a cross-sectional view showing a portion of an optical film to explain the transmission and reflection of light in a light pipe used in a lighting device, and FIG. 1B illustrates the transmission and reflection of light in a light pipe used in a lighting device. It is a perspective view showing a part of the optical film for the purpose. However, for ease of understanding, the structured outer surface is shown as the upper side and the structured outer surface is shown as the lower side.

First, referring to FIGS. 1A and 1B, light from a light source (not shown) is incident and refracted by an unstructured inner surface of the optical film as shown by an arrow (one point), and total reflection at both sides of the structured outer prism (2 and 3 points), whereby the outwardly directed light is refracted at the inner surface (4 points) and input back into the interior.

When the total reflection process is repeated, light proceeds substantially along the longitudinal direction of the light pipe, and almost no light loss occurs in the air inside the light pipe.

Thus, light can be transmitted through the light pipe at almost short distance as well as at a short distance.

The optical film used in the lighting device is structured on one side, the inner surface of the opposing side is an unstructured flat film, and the flat film is shaped into a cylindrical shape while being accommodated inside the cylindrical transparent acrylic housing.

2 is a perspective view showing a lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the lighting device 100 according to the present invention may include a connection unit 110, a light source unit 120, and a light pipe 120.

The connection unit 110 may be connected to an external power supply unit to apply power required to the light source unit 120. The connection unit 110 may be made of a conductive metal to apply power.

As shown in the drawing, two connection parts 110 may be provided at both sides of the light pipe 120. If the length and size of the light pipe 120 is adjusted to the same length and size as a conventional fluorescent lamp, it can be used as a lighting device replacing the fluorescent lamp.

The light source unit 120 includes at least one light source (not shown) for generating light. The light source (not shown) may be configured as at least one of a point light source, a linear light source, and a surface light source.

The light source according to the present invention may be configured as a light emitting diode (LED). In the light source unit 120, light sources (not shown) are arranged in a predetermined arrangement on a printed circuit board (not shown), and a power source applied from the connection unit 110 may be electrically connected to the light source (not shown).

In addition, at least one light emitting diode may be provided according to the use of the lighting device to obtain desired illuminance.

A light emitting diode is a semiconductor device that emits light by passing a current through a compound such as gallium arsenide, and has low power consumption and a lifetime of 100,000 hours, so that once installed, there is almost no need for replacement or maintenance.

Therefore, when the light source (not shown) is composed of a light emitting diode, there is an advantage that the lighting device 100 can be used semi-permanently.

The light pipe 130 outputs light to the outside by receiving and transmitting and distributing light generated by the light source unit 120.

The light pipe 130 may include an optical film that evenly distributes the light generated by the light source unit 120 by reflecting or refracting the light.

The optical film may include a surface structured in a prism shape or the like, and may transmit light to an area spaced apart from the light source 120 by reflecting or refracting the light generated by the light source 120.

A detailed description of the structure of the light pipe 130 will be described later with reference to FIGS. 4 to 8.

3 is a cross-sectional view of a portion of a lighting device for explaining an aspect in which light is emitted to the outside of the lighting device.

Referring to FIG. 3, the lighting apparatus 100 may include a connection unit (not shown), a light source unit 120, and a light pipe 130.

The light pipe 130 receives the light generated by the light source unit 120, transmits and distributes the light, and outputs the light to the outside, and supports the optical film 140 and the optical film 140 including the structured first surface. It may include a support member 135.

The light source 125 provides light to the inside of the light pipe 130 by using power applied through an external power supply means.

The light input to the inside of the light pipe 130 has an angle of incidence less than or equal to a predetermined critical angle θ by a ratio of the refractive index between the support member 135 and the support member 135 and the optical film 140. With this, light is reflected by the total reflection condition according to Snell's Law, which is well known in the art, whereby the light traveling toward the outside of the light pipe 130 is again inside the light pipe 130. Constrained to substantially progress in the longitudinal direction of the light pipe (130).

At this time, since the medium filling the inside of the light pipe 130 is air, light may be guided inside the light pipe 130 with almost no loss.

On the other hand, light incident at an incident angle exceeding a predetermined critical angle θ is immediately emitted through the outer surface of the support member 135.

As described above, the light input into the light pipe 130 is transmitted in the longitudinal direction of the light pipe 130 and is discharged to the outside.

4 to 9 are cross-sectional views showing various cross-sections of A-A 'of the lighting apparatus shown in FIG.

Referring to FIG. 4, the optical pipe 150 according to the present invention may include an optical film 155 including a first surface 155a structured thereon and a support member 160 supporting the optical film 155. have.

Referring to FIG. 4, the optical film 155 may include a structured first surface 155a and a second surface 155b opposite to the first surface 155a.

The first surface 155a may be structured in a predetermined pattern, and in one embodiment, may be structured in a prism pattern. In particular, the prism pattern may extend in the longitudinal direction of the light pipe 150 and may have an isosceles triangle, equilateral triangle, or trapezoid shape.

Although not shown, the structured first surface 155a may include at least one first bead (not shown). The structured first surface 155a may form the resin by UV curing, and the resin is transparent, has excellent mechanical properties, and has good balance of heat resistance, cold resistance, and electrical properties, such as PE (Poly ethylene), PP (Polypropylene), It may include any one of polycarbonate (PC), polyester and acryl.

Here, the first bead (not shown) may be included in a predetermined weight part on the first surface 155a structured with the resin to prevent the transmittance of light incident from the light source from decreasing, and the first bead (not shown) may be included. May be any one or more selected from the group consisting of polymethyl methacrylate (PMMA), polystyrene, and silicone.

The first bead (not shown) distributed in the first surface 155a may have an irregular distribution without having a regular distribution in the first surface 155a.

In addition, a first bead (not shown) distributed in the first surface 115a may be completely included in the first surface 155a so as not to be exposed on the surface of the first surface 155a.

Meanwhile, the first surface 155a of the optical film 155 may be disposed to face the support member 160.

The support member 160 is disposed outside the optical film 155 to support the optical film 155, and protects the optical film 155 from dust that may be introduced from the outside or impact that may be applied from the outside.

In addition, as the support member 160 guides the light guided by the optical film 155 once more, the light transmission efficiency of the light pipe 150 may be increased.

The optical film 155 preferably includes a thermoplastic resin material excellent in light transmittance and excellent in impact resistance and heat resistance.

For example, the optical film 155 may include polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), or the like.

In particular, polycarbonate is not easily broken due to its high strength and is not easily deformed, and its high visible light transmittance is suitable as a material of the optical film 155. On the other hand, the support member 160 may include an acrylic resin.

Referring to FIG. 5, the optical pipe 200 according to the present embodiment includes an optical film 205 including a structured surface 205a, a support member 240 for supporting the optical film 205, and a support member 240. ) And the diffusion film 235 disposed between the optical film 205.

Since the optical film 205 and the support member 240 for supporting the optical film 205 are the same as the description of FIG. 4 described above, description thereof will be omitted.

Diffusion sheet 235 is a diffusion sheet 235 to improve the brightness by diffusing the light incident from the light source, it may be disposed between the optical film 205 and the support member 240 as shown, otherwise the optical It may be disposed inside the film 205.

In addition, the direction of the first diffusion layer 222 may also be formed toward the inside of the light pipe 200, and alternatively, may be formed toward the outside of the light pipe 200.

The diffusion sheet 235 may have a first diffusion layer 222 including a first resin 215 and at least one second bead 220 on the base film 210.

The first resin 215 may include any one of PE (Polyethylene), PP (Polypropylene), PC (Polycarbonate), Polyester, and Acryl having excellent mechanical properties and balance heat resistance, cold resistance, and electrical properties. .

The second bead 220 may be any one or more selected from the group consisting of polymethyl methacrylate (PMMA), polystyrene, and silicone.

In order to prevent the first diffusion layer 222 from decreasing the transmittance of light incident from the light source, the second bead 220 may be included in a predetermined weight part on the first resin 215, and may be included in the first resin 215. The distributed second beads 220 may have an irregular distribution without having a regular distribution in the first resin 215.

In addition, the second beads 220 distributed in the first resin 215 may be completely included in the first diffusion layer 222 so as not to be exposed on the surface of the first diffusion layer 222.

In addition, the diffusion sheet 235 may further include a protective layer 232 including at least one third bead 230 under the base film 210.

The protective layer 232 of the diffusion sheet may serve to improve heat resistance of the diffusion sheet 235. In more detail, the protective layer 232 may include the second resin 225 and at least one third bead 230 dispersed in the second resin 225.

The second resin 225 may include any one of PE (Polyethylene), PP (Polypropylene), PC (Polycarbonate), Polyester, and Acryl, which are transparent, have excellent mechanical properties, and have balanced heat resistance, cold resistance, and electrical properties. .

The third bead 230 may be manufactured using the same or different types of resins as the first resin 215, and the size of the third bead 230 may be substantially the same, and may be formed in the second resin 225. The distribution at can also be regular. In contrast, the sizes of the third beads 230 are different from each other, and the distribution in the second resin 225 may be irregular.

In addition, the above-described second bead 220 and the third bead 230 may use the same material, and may be different from each other.

The protective layer 232 may prevent the diffusion sheet 235 from being deformed by heat generated from the light source. That is, wrinkles do not occur in the diffusion sheet 235 by the base film 210 having high heat resistance, and even when the diffusion sheet 235 is deformed at a high temperature, the restoring force of returning to the original diffusion sheet 235 again at room temperature is excellent. .

In addition, the protective layer 233 may also serve to prevent scratches on the diffusion sheet 235 by an external impact or other physical force.

Referring to FIG. 6, the optical pipe 250 according to the present embodiment includes an optical film 255 including a structured surface 255a, a support member 260 for supporting the optical film 255, and a support member 260. ) And the reflective film 265 disposed between the optical film 255.

The optical film 225 and the support member 260 are the same as in FIG. 4 described above, and will not be described below.

The reflective film 265 is a means for reflecting light traveling in the light pipe 250.

Accordingly, when the reflective film 265 is disposed in a predetermined region of the light pipe 250, light may be prevented from being emitted through the region where the reflective film 265 is disposed, and the reflective film 265 may not be disposed. The amount of light emitted through the uncovered area may increase.

The reflective film 265 may be made of a highly reflective material, and may be obtained by, for example, coating a metal material having excellent reflectivity such as aluminum (Al) and silver (Ag) on a resin surface.

As shown in FIG. 6, the reflective film 265 may be disposed on a portion of an inner surface of the support member 260 of the light pipe 250.

When the reflective film 265 is disposed between the inner surface of the support member 260 and the optical film 255, the illuminance of the light emitted by the reflective film 265 may be improved.

The size and the number of regions where the reflective film 265 is disposed may be variously selected according to the purpose of preventing light from being emitted to a specific region and increasing the amount of light emitted to a certain region.

Although not shown, the diffusion sheet 235 described above with reference to FIG. 5 may be disposed outside the first surface 255a of the optical film 255, and a predetermined region between the diffusion sheet 235 and the support member 260 may be provided. The reflective film 265 may be disposed on the film.

Referring to FIG. 7, the optical pipe 300 according to the present embodiment includes an optical film 305 including a surface 305a to be structured, a support member 310 for supporting the optical film 305, and a support member ( The reflective film 315 disposed between the optical film 305 and the optical film 305 may further include a discharge film 320 disposed between the region where the reflective film 315 is disposed and the optical film 305.

The optical film 305, the support member 310, and the reflective film 315 are the same as those of FIG. 5 described above, and will not be described below.

The reflective film 315 emits light to only one side of the light pipe, The discharge film 320 changes the angle of the light to be totally reflected so that the light can be emitted to the outside without any more total reflection.

The discharge film 320 may be uniformly discharged along the length of the light pipe 300 with a constant illuminance as the area increases away from the light source, that is, increases in the longitudinal direction of the light pipe 300.

The size and the number of regions where the discharge film 320 is disposed may be variously selected according to the purpose of emitting light to a specific region and increasing the amount of light emitted to the specific region.

For example, the discharge film 320 may not only allow the light to be emitted for a predetermined cross section of the light pipe 300, but also the size of the cross-sectional area of the discharge film 320 for the entire circumferential direction of the optical film 305. By changing or changing the distance between the adjacent discharge film 320 to increase the area of the discharge film 320 in the longitudinal direction, a constant light around the entire light pipe 300 along the length of the light pipe 300 May be released.

In addition, as described above in FIG. 7, a diffusion sheet (not shown) may be further included between the support member 310 and the optical film 305.

Referring to FIG. 8, the optical pipe 350 according to the present exemplary embodiment may include an optical film 355 including a structured surface 355a and a support member 340 for supporting the optical film 355. .

The optical film 355 and the support member 340 are the same as in FIG. 3 described above, and only the differences will be described below.

The outer surface of the support member 340 may be surface treated so that at least one of the protrusion and the groove is formed.

By forming the projections 345 and the grooves 346 on the surface of the support member 340, it is possible to induce diffuse reflection and scattering of light generated from the light source of the light source unit to emit uniform light through the entire light pipe 350. have.

In addition, by increasing the density of the projections 345 and the groove 346 in proportion to the distance of the light source portion, the greater the distance from the light source portion to increase the scattering of light to emit more uniform light through the entire light pipe 350 can do.

Surface treatment of the protrusion 345 and the groove 346 may be performed by injection, extrusion, heat curing or UV curing the support member 340. Through the surface treatment, protrusions and grooves may be formed on the surface of the support member 324.

In addition, only one of the protrusions 345 and the grooves 346 may be formed, and the protrusions 345 and the grooves 346 may be simultaneously formed.

Referring to FIG. 9, the optical pipe 400 according to the present exemplary embodiment may include an optical film 405 including a structured surface 405a and a support member 410 for supporting the optical film 405. .

The optical film 405 and the support member 410 are the same as in FIG. 3 described above, and only the differences will be described below.

The second diffusion layer 425 including the third resin 415 and the fourth bead 425 may be formed on an outer surface of the support member 410.

Therefore, the second diffusion layer 425 including the third resin 415 and the fourth bead 425 is applied to the surface of the support member 410 to induce diffuse reflection and scattering of light generated from the light source unit. 400) It is possible to emit a uniform light throughout.

The fourth bead 425 may include any one selected from the group consisting of polymethyl methacrylate (PMMA), polystyrene, and silicone, and the third resin 415 is transparent, has excellent mechanical properties, and is heat resistant, cold resistant, and electrical. It may include any one of poly ethylene (PE), polypropylene (PP), polycarbonate (PC), polyester, and acryl with balanced properties.

10 to 11 are cross-sectional views showing various cross-sections of B-B 'of the lighting apparatus shown in FIG.

Referring to FIG. 10, the lighting apparatus 500 according to the present exemplary embodiment includes a connection part 505, a light source unit 510 including a light source 515, and an optical pipe including an optical film 525 and a support member 520. 540, and may include at least one of the reflective film 530 and the discharge film 535 between the support member 520 and the optical film 525 in a predetermined region.

The structure and function of the connection part 505, the light source part 510, the light pipe 540, the reflective film 530, and the discharge film 535 are the same as described above, and thus, only differences will be described below.

As shown in FIG. 10, the light source unit 510 may be disposed at both side surfaces of the light pipe 540 in the longitudinal direction.

When the light source unit 510 is disposed on both side surfaces of the light pipe 540 in the longitudinal direction, the area of the discharge film 535 increases in the longitudinal direction of the light pipe 540 as the distance from the light source 515 increases. The discharge film 535 may be formed such that the middle portion of the light pipe 540, which is the furthest from the light source 515 disposed at the side, is widest.

Referring to FIG. 11, the lighting device 550 according to the present embodiment includes a connection part 555, a light source part 560 including a light source 565, and an optical pipe including an optical film 575 and a support member 570. Includes a 590, at least one of the reflective film 580 and the discharge film 585 in a predetermined region between the support member 570 and the optical film 575, on one side of the light pipe 590 It may further include a reflector 595.

The structure and function of the connection part 555, the light source part 560, the light pipe 590, the reflective film 580, and the discharge film 585 are the same as described above, and thus only the differences will be described below.

The reflector 595 may be disposed on one side of the light pipe 590 in the longitudinal direction, and may reflect light transmitted from the light source 565 into the light pipe 595 to improve light utilization efficiency.

The reflector 595 may include a coating film including a metal material having a high reflectance such as aluminum or silver so as to efficiently reflect the light transmitted by the light pipe 590.

The reflector 595 may have a planar or spherical shape. When the reflector 595 is formed in a spherical shape, the reflector 595 may be a concave mirror having a curvature of 0.001 or less.

When the reflector 595 is disposed on one side of the light pipe 590 in the longitudinal direction, the area of the discharge film 585 increases in the longitudinal direction of the light pipe 590 as the distance from the light source 565 increases. The closer to 560, the smaller the area of the discharge film 585, and the closer to the reflector 595, the larger the area of the discharge film 585.

12 is a perspective view of a lighting apparatus according to another embodiment of the present invention.

Referring to FIG. 12, the lighting device 600 according to the present invention may include a connection part 610, a light source part 620, and a light pipe 630. The connection part 610, the light source part 620, and the light pipe 630 are the same as in FIG.

Surface treatment of at least one of the outer surface and the inner surface of the surface of the support member of the light pipe 630 to induce diffuse reflection and scattering of light generated from the light source unit 620 to uniform light through the entire surface of the light pipe 630 It can be released.

The surface treatment may be at least one of injection, extrusion, thermosetting, and UV curing, and may form protrusions 640 and grooves 645 on the surface through surface treatment.

The densities of the protrusions 640 and the grooves 645 may increase in proportion to the distance from the light source unit. In addition, only one of the protrusions 640 or the grooves 645 may be formed, and the protrusions 640 and the grooves 645 may be simultaneously formed.

13 and 14 are plan views illustrating the discharge film of the lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 13, the lighting device 650 according to the present invention may include a connection part 655, a light source 660, a light pipe 670, and an emission film 675. The connection unit 655, the light source unit 660, and the light pipe 670 are the same as those of FIG. 2 described above, and will not be described.

The discharge film 675 may increase in size in proportion to the distance from the light source 660. In the lighting device 650 of FIG. 13, the size of the discharge film 675 in the middle portion of the light pipe 670 is disposed at both sides of the light pipe 670 so that the light source 660 is located farthest from the light source 660. It is possible to increase the amount of light emitted by increasing the size, so that uniform light is emitted through the entire light pipe 670.

Referring to FIG. 14, the lighting apparatus 700 according to the present invention may include a connection part 705, a light source part 710, a light pipe 720, an emission film 725, and a reflector 730. The connection part 705, the light source part 710, and the light pipe 720 are the same as those of FIG. 2 described above.

As described above, the discharge film 725 may increase in size in proportion to the distance from the light source unit 710. The illuminating device 700 of FIG. 14 arranges the reflector 730 on one side of the light pipe 720, so that the discharge film 725 of the portion where the reflector 730, which is the furthest point from the light source 710, is disposed. By increasing the size, the amount of light emitted may be increased, so that uniform light may be emitted through the entire light pipe 720.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1A is a cross-sectional view of a portion of an optical film to illustrate the transmission and reflection of light in a light guide used in a lighting device;

Figure 1b is a perspective view showing a portion of the optical film to explain the transmission and reflection of light in the light guide used in the lighting device,

2 is a perspective view showing a lighting apparatus according to an embodiment of the present invention,

3 is a cross-sectional view of a portion of a lighting device for explaining an aspect in which light is emitted to the outside of the lighting device;

4 to 9 are cross-sectional views showing various cross-sections of A-A 'of the lighting device shown in FIG.

10 to 11 are cross-sectional views showing various cross-sections of B-B 'of the lighting device shown in FIG.

12 is a perspective view showing a lighting apparatus according to another embodiment of the present invention, and

13 and 14 are plan views illustrating the discharge film of the lighting apparatus according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

100: lighting device 110: connecting portion

120: light source unit 130: light pipe

Claims (19)

At least one connection part connected to an external power supply means to apply power; At least one light source unit generating light using the power source; And And a light pipe for transmitting and distributing the light generated by the light source unit. The light pipe, Optical film; And And a support member disposed outside the optical film. The method of claim 1, And the light source unit comprises a light emitting diode. The method of claim 1, And the optical film comprises a first surface to be structured and a second surface opposite to the first surface. The method of claim 3, The first surface has a prism shape. The method of claim 3, The optical film is a lighting device, characterized in that the first bead on the first surface. The method of claim 5, The first bead is a lighting device, characterized in that any one or more selected from the group consisting of polymethyl methacrylate (PMMA), polystyrene and silicone. The method of claim 1, And a diffusion sheet having a base film between the optical writing film and the support member and a first diffusion layer including a first resin and at least one second bead on one surface of the base film. . The method of claim 7, wherein The second bead is a lighting device, characterized in that any one or more selected from the group consisting of polymethyl methacrylate (PMMA), polystyrene and silicon. The method of claim 7, wherein The diffusion sheet further comprises a protective layer on a surface opposite to one surface of the base film. The method of claim 9, The protective layer, the illumination device, characterized in that it comprises a second resin and at least one third bead. The method of claim 1, The support member is an illumination, characterized in that consisting of at least one polymeric material selected from the group consisting of polycarbonate (PC), polymethyl methacrylate (PMMA), acrylic, polypropylene, polystyrene and polyvinyl chloride Device. The method of claim 1, The support member is a lighting device, characterized in that at least one of a plurality of projections and grooves formed on the surface. The method of claim 1, The support member is a lighting device, characterized in that the diffusion layer comprising a third resin and at least one fourth bead formed on the surface. The method of claim 1, Lighting device further comprises a discharge film between the support member and the optical film, the emission of light to proceed. The method of claim 14, The discharge film, the illumination device, characterized in that the area is wider as the distance from the light source. The method of claim 1, Lighting device further comprises a reflective film for reflecting the light propagating inside the light pipe. The method of claim 16, The reflecting film is an illumination device, characterized in that disposed on the inner surface of the support member. The method of claim 1, And a reflector disposed at one end of the light pipe to reflect light generated from the light source to the inside of the light pipe. The method of claim 18, The reflector is at least one of aluminum and silver.

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