KR101812320B1 - Lighting Device - Google Patents

Abstract

The lighting device includes a lower case, a light source, a light guide plate, and an upper case. The light source unit is disposed on one side of the lower case. The light guide plate is disposed in parallel with the light source portion. The upper case is located on one side of the light guide plate and engages with the lower case. The upper case includes a plate-shaped base portion disposed on the light guide plate and an edge portion extending stepwise from both sides of the base portion. The thickness of the base portion is thicker than the thickness of the edge portion.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus including a plurality of light emitting elements to implement light.

Generally, bulbs or fluorescent lamps are widely used as indoor or outdoor illumination lamps, and such bulbs or fluorescent lamps have a short life span and therefore frequently have to be replaced. In addition, the conventional fluorescent lamp has a problem that the illuminance gradually decreases due to deterioration over time of its use.

In order to solve such a problem, a lighting device using an LED capable of realizing excellent controllability, fast response speed, high electric light conversion efficiency, long lifetime, low power consumption and high luminance characteristics and emotional lighting has been developed.

On the other hand, in many cases, many lighting devices using LEDs are formed in a limited shape or shape depending on the structure of the installed space. Therefore, there is a demand for a lighting apparatus in which the use and spatial freedom can be increased with respect to the space or space in which the lighting apparatus is used.

The embodiment provides an illumination device with improved assemblability.

In addition, the present invention provides a lighting device with improved stable coupling without shaking of structures.

Further, an illumination device with improved heat radiation characteristics is provided.

Further, a lighting device with improved light efficiency is provided.

The technical problems to be solved by this embodiment are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be clearly understood from the following description to those skilled in the art It will be possible.

In one embodiment according to the present invention, the illumination device includes a lower case; A light source unit disposed on one side of the lower case; A light guide plate disposed in parallel with the light source unit; And an upper case disposed on one side of the light guide plate and coupled with the lower case, wherein the upper case includes a plate-shaped base portion disposed on the light guide plate; And an edge portion extending from both sides of the base portion with a step difference, wherein a thickness of the base portion is thicker than a thickness of the edge portion.

The lighting apparatus according to the present invention is easy to assemble.

Further, the lighting apparatus according to the present invention has improved heat radiation characteristics.

Further, the illumination device according to the present invention has improved light efficiency characteristics.

Further, the illumination device according to the present invention may have a structurally stable support structure.

Further, the lighting apparatus according to the present invention can overcome the space limitation due to the installation of parts, and can reduce the manufacturing cost.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention.
2 is an exploded perspective view of a lighting apparatus according to an embodiment of the present invention.
3A is a side exploded view of a lighting device according to an embodiment of the present invention.
3B is a side view of a lighting apparatus according to an embodiment of the present invention.
4 is a view for explaining a first structure of a coating film disposed on an upper part of a light guide plate according to an embodiment of the present invention.
5 is a view for explaining a second structure of a coating film disposed on an upper portion of a light guide plate according to an embodiment of the present invention.
6 is a view for explaining a third structure of a coating film disposed on an upper portion of a light guide plate according to an embodiment of the present invention.
7A to 7C are diagrams for explaining the structure of a luminaire combined with a louver, according to an embodiment of the present invention.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

Further, in the description of the embodiment according to the present invention, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) quot; on " or " under " includes both two identical components being directly in direct contact with each other or one or more other components being indirectly formed between the same components. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one component.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a lighting apparatus according to an embodiment of the present invention, FIG. 3a is a side view of a lighting apparatus according to an embodiment of the present invention, FIG. 3B is a side view of a lighting apparatus according to an embodiment of the present invention. FIG.

1 to 3B, the lighting apparatus includes a case including a top case 200 and a bottom case 300, a light guide plate 500, and a light source unit 700.

<Case>

The case includes an upper case (200) and a lower case (300) separated from the upper case (200).

The upper case 200 has an overall plate shape and includes a base portion 210 and left and right edge portions 230 extending from the base portion. The base portion 210 and the edge portion 230 are connected with a step difference. At this time, the base portion 210, which is thicker than the edge portion 230, closely contacts the reflective sheet 400 and the light guide plate 500, which are disposed inside the upper case, so that the reflective sheet 400 and the light guide plate 500 can be prevented from moving.

The edge portion 230 has a rectangular shape as a whole but an opening groove 230a is formed at a side end of the edge portion 230 so as to have a space where the driving portion can be disposed on the left or right side.

The edge portion 230 is formed in the longitudinal direction of the edge portion 230 with a latching groove 230b in the joint region connected to the base portion 210. [ The substrate 710 of the light source unit 700 is inserted into the latching groove 230b and can be stably fixed.

The lower case 300 includes a body 310 having two surfaces 301 and 303 substantially perpendicular to each other and a bezel 330 protruding in a vertical direction from one surface of the body 310, And a guide part 350 protruding in the vertical direction from the other surface of the guide part 350.

The body 310 has one surface 301 on which the light source unit 700 is disposed and another surface 303 on which the edge portion 230 of the upper case is disposed and the two surfaces 301 and 303 are arranged in directions perpendicular to each other do. The body 310 is formed with an insertion groove 300a for a space in which the driving unit 900 is disposed to drive the light source unit 700 on the side thereof. (300b) is formed to communicate with the insertion groove (300a).

In addition, the corners of the body 310 are rounded so that the impact can be alleviated when an impact is applied from the outside.

The body 310 has a guide groove 310a on one side in the longitudinal direction. The plurality of guide grooves 310a may be arranged in parallel to the longitudinal direction of the body 310. [ The guide groove 310a of the body widens the heat dissipation surface area and effectively dissipates the heat generated in the light source part. Also, when the light generated from the light source unit 700 is emitted to the outside through the light guide plate 500, a louver 1000 capable of adjusting the direction of light can be slid into the guide groove 310a.

The bezel part 330 supports both lower sides of the light guide plate 500 and prevents the spot characteristic of light generated due to the short optical path when the light emitted from the light source part 700 is emitted to the outside. The width of the bezel 330 can be reduced as much as possible so that the effective area is not reduced within a range where the spot characteristic of light does not occur by partitioning the effective area which is the light output area.

The guide part 350 is disposed in the same direction as the longitudinal direction of the edge part 230 when the edge part 230 of the upper case is disposed on the other surface 303 of the body 310 and is engaged with the lower case 300. [ It is possible to prevent the left and right movement of the upper case 200 by protruding from the other surface 303 of the body. At this time, the protrusion height of the guide portion 350 may be substantially the same as the thickness of the edge portion 230 of the upper case.

In such a case, the edge portion 230 of the upper case 200 is seated on one surface 303 of the body 310 of the lower case 300. The contact portion between the two cases is engaged with the screw 10 and has a rectangular shape whose cross section is entirely opened at the bottom.

The case has a structure that is detachable between two cases when maintenance is required for a structure such as the light source unit 700, the light guide plate 500, and the reflection sheet 400 disposed inside. At this time, in order to improve the heat transfer characteristics of the two cases, a heat radiation sheet (not shown) may be disposed at a contact portion between the two cases.

The upper case 200 and the lower case 300 may be made of a PC material capable of reducing weight, but a material having high thermal conductivity is used so that the heat generated from the light source part can be easily released to the outside through the cases . For example, it is possible to use a metal such as aluminum and iron, and the case may have an elastic force.

<Reflective Sheet>

The reflective sheet 400 has a plate shape corresponding to one surface of the light guide plate 500 and is disposed between the upper case 200 and the light guide plate 500. The reflective sheet 400 has a flexible plastic material, unlike the case material. If the base portion of the upper case is coated with a reflective material, the reflective sheet can be removed.

When the light emitted from the light source unit 700 is emitted to the outside through the light guide plate 500, the reflection sheet 400 reflects the light emitted to the rear of the light guide plate 500 so as to be emitted to the outside.

<Light guide plate>

The light guide plate 500 is optically coupled to the light source unit 700. That is, the light guide plate 500 is arranged side by side with the light source unit 700 to guide a path of light emitted from the light source unit 700. The shape of the light guide plate 500 has a rectangular plate shape similar to the shape of the reflection sheet, and the lower surface is stepped. A bezel portion 330 of the lower case 300 is disposed on the lower surface of the stepped portion to support the light guide plate 500.

The light guide plate 500 converts a point light source generated in the light source unit into a surface light source, and a coating film 510 having a specific pattern or a roughness may be formed on one surface so that light incident to the inside may be emitted to the outside have. The coating film having a specific pattern or roughness diffuses or scatters light and emits it to the outside. Further, the light guide plate 500 is made of transparent resin, and can be printed by a silkscreen printing method or the like.

The auxiliary reflector sheet 30 is disposed in a region where the bezel 330 of the lower case contacts the peripheral portion of the light guide plate 500. When the light emitted from the light source unit 700 is irradiated on the bezel, So that the efficiency of light emitted from the outside is substantially improved.

<Light source part>

The light source unit 700 includes a substrate 710, a light emitting element 730, and a driving driver 750.

The substrate 710 is a rectangular printed circuit board.

The plurality of light emitting devices 730 are formed on one surface of the substrate 710 in the longitudinal direction of the substrate. The light emitting device 730 may be a light emitting diode that emits light having the same color and may emit light of a different color. Therefore, the emotional lighting device can be implemented because a combination of two different colors enables light of various colors. The light emitting diode may be a light emitting diode that emits at least one of blue, red, and green light.

Although not shown in the drawing, a light emitting diode can emit light having its own color by allowing the transparent resin to seal the light emitting diode on the top, but when emitting the original color, for example, In the case of a light emitting diode that emits light, a resin including a yellow-based phosphor on the upper portion may seal the blue light emitting diode and emit white light.

In this embodiment, a light emitting diode is taken as an example of a light source, but the present invention is not limited thereto, and any light emitting element capable of emitting light can be used.

The driving driver 750 may be disposed at an end of the other surface of the substrate 710 on which the light emitting element 730 is not disposed.

The light source unit 700 includes a plurality of light source units 700 disposed on one surface 301 of the body 310 of the lower case so that one surface of the substrate on which the light emitting devices 730 included in each light source unit is disposed faces each other, The substrate 710 of each light source part is inserted into the latching groove 230b of the upper case 200.

Although not shown in the drawing, a heat-radiating sheet may be disposed at a contact portion between the light source unit 700 and the body 310 of the lower case. Such a heat radiation sheet conveys heat generated in the light source part to the lower case through conduction, and such heat is emitted to the outside, thereby improving heat radiation characteristics.

A light excitation film containing a fluorescent material may be disposed between the light source 700 and the light guide plate 500. Such a photo-excited film can convert a part of the wavelength of the light emitted from the light source part to change the color of the light. Further, the photoexcitation film may include a transparent resin and a fluorescent substance contained in the transparent resin. A curing agent or an additive may be contained in the transparent resin, the curing agent cures the transparent resin, and the additive disperses the fluorescent material evenly inside the transparent resin. In addition, a diffusion material may be included in the transparent resin, and the diffusion material improves the refraction of the light source to increase the excitation ratio of the fluorescent material.

<Driving Section>

The driving unit 900 is inserted into the opening groove 230a of the edge portion 230 of the upper case 200 and the insertion groove 300a of the body of the lower case and is inserted into the insertion groove 300a of the light source unit 700 And is electrically coupled to the driving driver 750.

<Cap>

The cap 100 is disposed on the front and rear sides of the light guide plate 500 disposed in the case to prevent light generated in the light source portion from being emitted to the front and rear sides of the light guide plate. The cap 100 has a fastening hole 100a which can be fastened to the side of the guide groove 310a of the lower case 300 with the screw 20. [ The cap 100 may be made of a metal material or a plastic material having a light weight.

4 is a view for explaining a first structure of a coating film disposed on an upper part of a light guide plate according to an embodiment of the present invention.

4, when the light emitted from the light source unit is emitted to the outside through the light guide plate, the light output effective area AD is divided by the opening formed by the coupling of the upper case 200 and the lower case 300 . That is, the region where the light emitted from the light source unit 700 is emitted to the outside through the light guide plate 500 is the effective region AD, even though the light emitted from the light source unit 700 passes through the light guide plate 500, An area not covered by the light shielding area 330 is defined as a non-effective area NAD.

Thus, the coating film 510 is disposed on the upper surface of the light guide plate 500 corresponding to the effective area AD and the non-effective area NAD. The coating film 510 may have local roughness at a portion of the surface, and may have roughness over the entire surface to improve the uniformity property of light. Accordingly, the light emitted to the upper surface of the light guide plate is diffused or scattered in the downward direction of the light guide plate to improve the light efficiency, and at the same time, improves the unifferential property of light emitted to the outside.

On the other hand, the roughness of the coating film may be uniform on the entire surface, but it may have a roughness difference depending on the position. That is, the roughness of the coating film disposed on the upper surface of the central portion of the light guide plate 500 corresponding to the effective area AD is larger than the roughness of the coating film disposed on the upper surface of the peripheral portion of the light guide plate corresponding to the ineffective area NAD. This is to increase the roughness of the coating film corresponding to the effective region AD to substantially improve the diffusion of light and the egg production rate.

Although not shown in the drawing, the coating film may be disposed on the lower surface of the light guide plate 500. The surface roughness of the coating film disposed on the lower surface may be the same as the surface roughness of the coating film disposed on the upper surface. As a result, the uniformity characteristic of light and the light efficiency are further improved.

Further, instead of the coating film disposed on the lower surface of the light guide plate, the light guide plate itself may have a roughness.

5 is a view for explaining a second structure of a coating film disposed on an upper part of a light guide plate according to an embodiment of the present invention.

Referring to FIG. 5, the upper surface of the light guide plate 500 corresponding to the effective area AD and the non-effective area NAD may have a locally rough surface, and the entire upper surface may have a roughness . The effect of this has already been described above and will be omitted.

Further, the roughness of the upper surface of the light guide plate 500 may be uniform on the entire surface, but may have a roughness difference depending on the position. That is, the roughness of the upper surface of the central part of the light guide plate corresponding to the effective area AD is larger than the roughness of the upper surface of the peripheral part of the light guide plate corresponding to the ineffective area NAD. This is to increase the roughness of the upper surface of the light guide plate corresponding to the effective area, thereby substantially improving the light diffusion and the egg production rate.

Although not shown in the drawing, the lower surface of the light guide plate may have a roughness. The roughness of the lower surface of the light guide plate may be the same as or different from the roughness of the upper surface depending on the characteristics of light and the light efficiency characteristics.

6 is a view for explaining a third structure of a coating film disposed on an upper portion of a light guide plate according to an embodiment of the present invention.

Referring to FIG. 6, the top surface of the light guide plate 500 corresponding to the effective area AD and the ineffective area NAD has a plurality of lens shapes, as shown in FIG. In this case, the size of the lens is in the unit of micrometers, and the shape of the lens may be locally formed on the upper surface of the light guide plate, or may be formed on the entire upper surface of the light guide plate. The effect of this has already been described above and will be omitted.

Further, the distance between the lenses of the light guide plate may be constant on the entire surface, but may vary depending on the position. That is, the distance D1 between the lenses at the center of the light guide plate corresponding to the effective area AD is smaller than the distance D2 between the lenses at the periphery of the light guide plate corresponding to the ineffective area.

Though not shown in the drawing, the lower surface of the light guide plate itself may have a plurality of lens shapes, and a predetermined pattern may be formed.

7A to 7C are diagrams for explaining the structure of a luminaire combined with a louver, according to an embodiment of the present invention.

7A to 7C, a louver is slidably coupled to both guide grooves formed in the body longitudinal direction of the lower case.

The material of the louver 50 is preferably plastic or metal, and the inner surface may be coated with a reflective material.

The shape of the louvers may be symmetrically formed around the opening of the case as shown in Figs. 7A and 7B or asymmetric around the opening of the case, as shown in Fig. 7C, depending on the directional angle of light emitted from the light guide plate.

Depending on the size of the light irradiation area, part of the louvers in the light irradiation direction may have a curved surface as shown in Fig. 7A, or part of the louvers in the light irradiation direction may have a flat surface as shown in Fig. 7B.

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 exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

200: upper case
300: Lower case
400: reflective sheet
500: light guide plate
700: light source

Claims (7)

Lower case;
A light source unit disposed on one side of the lower case, the light source unit including a substrate and a light emitting element;
A light guide plate disposed in parallel with the light source unit; And
An upper case disposed on one surface of the light guide plate and coupled with the lower case;
And a coating layer disposed between the light guide plate and the upper case and having one of a roughness and a specific pattern,
The upper case
A plate-shaped base portion disposed on the light guide plate;
An edge portion extending from both sides of the base portion with a step difference; And
And an engaging groove into which one end of the substrate of the light source unit is inserted and fixed,
Wherein a thickness of the base portion is thicker than a thickness of the edge portion.
The method according to claim 1,
And a heat radiating sheet disposed between the upper case and the lower case,
The lower case includes a body having two sides arranged in a direction perpendicular to each other, a bezel portion protruding in a vertical direction from one side of the two sides of the body, and a guide portion protruding vertically from the other side of the two sides of the body, ,
The area of the lower case of the lighting device is covered by the bezel of the lower case even though the light emitted from the light source passes through the effective area and the effective area is the area where the light emitted from the light source is emitted to the outside through the light guide plate The unexposed area is divided into non-valid areas,
The roughness of the upper surface of the central portion of the light guide plate corresponding to the effective region is greater than the roughness of the upper surface of the peripheral portion of the light guide plate corresponding to the non-effective region.
The method according to claim 1,
The lower case includes a body having two sides arranged in a direction perpendicular to each other, a bezel portion protruding in a vertical direction from one side of the two sides of the body, and a guide portion protruding vertically from the other side of the two sides of the body, ,
The area of the lower case of the lighting device is covered by the bezel of the lower case even though the light emitted from the light source passes through the effective area and the effective area is the area where the light emitted from the light source is emitted to the outside through the light guide plate The unexposed area is divided into non-valid areas,
The upper surface of the light guide plate corresponding to the valid area and the non-valid area has a plurality of lens shapes,
The distance between the lenses in the central portion of the light guide plate corresponding to the effective region is smaller than the distance between the lenses in the peripheral portion of the light guide plate corresponding to the ineffective region.
The method according to claim 1,
The lower case includes a body having two sides arranged in a direction perpendicular to each other, a bezel portion protruding in a vertical direction from one side of the two sides of the body, and a guide portion protruding vertically from the other side of the two sides of the body, ,
Wherein an insertion groove for a space in which the driving unit is disposed for driving the light source unit is formed on a side of the body and an opening communicating with the insertion groove is formed on a side of the light source unit.
The method according to claim 1,
A reflective sheet disposed on one side of the base to reflect light emitted from the light source; And
And a light excitation film disposed between the light source and the light guide plate and including a fluorescent material. delete delete

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