KR20190052916A - Lighting apparatus - Google Patents

Abstract

A lighting apparatus according to the present invention comprises: a substrate; a plurality of light emitting devices disposed on the substrate; a lens unit on which the lighting emitting devices are disposed; and a reflective member disposed between the substrate and the lens unit. The lens unit includes spherical protrusions having the same radius on one light emitting device. The spherical protrusions are spaced apart from each other in a first direction and a second direction perpendicular to the first direction with an increasing spacing distance with reference to a light emitting device disposed at the center of the substrate.

Description

LIGHTING APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus using a plurality of light emitting elements and having improved uniformity.

Generally, lights such as a billboard light, a flat light, a fluorescent light, a street light, a road light, and the like are installed for the purpose of emitting light in indoor or outdoor for a predetermined purpose. In this illumination, a light source for emitting light is provided.

In recent years, the business of replacing a light source installed in a light source with an LED (Light Emitting Diode) has been actively carried out. These LEDs are not only a light source with green, high efficiency, long life, but also a small amount of electricity consumed, which can contribute to energy saving.

On the other hand, a method of increasing the visibility by installing a large number of LEDs in an illumination lamp equipped with an LED, as the visibility is lowered due to the characteristic that the light emitted from the LED goes straight.

Particularly, a billboard lighting, a flat panel lighting, and the like are lighting devices having a large area, and a method of increasing the visibility by installing a plurality of LEDs is used because the light emitted from the LED has a straight line.

However, even if an illumination lamp having a plurality of LEDs is used, there is a problem that the brightness of light is not uniform, a contrast difference occurs between the LED light sources, and the illumination efficiency is lowered due to unevenness.

In order to solve such a problem, a plurality of illuminating device technologies equipped with a diffusing lens and a diffusing lens for uniformly diffusing light are disclosed.

However, in a lighting apparatus that diffuses light by using a conventional diffusion lens or a scattering pattern, the distance from the lens or the diffuser plate is increased in order to maintain a wide range of illumination angle from the central LED, .

In addition, when the center LED is used as the reference, the center brightest light is emitted. Therefore, in order to uniformly adjust the brightness to the edge area, the LED intensity at the center is weakly adjusted, There is a problem.

Accordingly, there is a demand for a technique for developing an illumination device that provides uniform light using a large number of LEDs even in a large area and has high luminance characteristics.

The present invention makes it possible to provide uniform light at a place where a large illumination light is required by using a lighting device.

The present invention makes it possible to provide a lighting apparatus which can increase the diffusion efficiency and emit brighter light while using less power consumption.

A lighting device of the present invention includes a substrate, a plurality of light emitting elements arranged on the substrate, a lens portion disposed on the plurality of light emitting elements, and a reflecting member disposed between the substrate and the lens portion, The light emitting device according to any one of claims 1 to 3, wherein the light emitting device includes a plurality of spherical protrusions having the same radius on one light emitting element, and the spherical protrusions are perpendicular to the first direction and the first direction And can be disposed with a spacing distance that gradually increases in a second direction.

The lens unit of the present invention is characterized in that the pattern of the spherical protrusions forms orthogonal coordinates (X, Y) in the first direction and the second direction, and the rectangular coordinates satisfy the following equations (1) and 2 > can be satisfied.

&Quot; (1) "

& Quot; (2) "

Herein, A, B, C, D, E, F, G, H, P and Q are pattern spacing coefficients, and Nix and Niy denote, And the number of the projections arranged in the second direction.

When the roughness (Rz) value of the surface of the present invention is 0.1 Mu m to 0.15 Mu m

The spherical projections of the present invention have 0.2 Mu m to 0.3 Lt; RTI ID = 0.0 > um. ≪ / RTI >

In the lens unit of the present invention, the incident surface on which the light emitted from the light emitting device is incident may be a flat surface.

In the light emitting device of the present invention, the plurality of light emitting devices may have the same spacing distance in the first and second directions.

The light emitting element of the present invention can emit white light.

According to the present invention, it is possible to provide an illumination device having a uniform luminance by using a diffusion lens having a certain pattern.

According to the present invention, it is possible to provide an illumination device having a uniform luminance without being restricted by the light irradiation area and the irradiation position.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood to those of ordinary skill in the art from the following description.

1 is a cross-sectional view of a lighting apparatus of the present invention.
FIG. 2 is a view showing in detail an A region, one light emitting element and a corresponding lens portion of the illumination apparatus shown in FIG.
3 is a photograph showing an inner light emitting element and an outer lens of the illumination device of the present invention.
4 is an enlarged view of the area B shown in Fig.
5 is a graph showing a change in luminance distribution according to a pattern of the lighting apparatus of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise. The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification.

It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

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

1 is a cross-sectional view of a lighting apparatus of the present invention. Referring to FIG. 1, a lighting apparatus 100 of the present invention includes a substrate 10, a light emitting element 20, a lens portion 30, and a reflective member 40.

The substrate 10 may include a circuit pattern that can be electrically connected to the light emitting device 20. [ According to an embodiment, the substrate 10 may include at least one of a ceramic substrate, a printed circuit board (PCB), a metal core PCB (MPPCB), and a flexible PCB (FPCB) .

The light emitting device 20 may be electrically connected to the substrate 10. According to the embodiment, the lighting apparatus 100 can be disposed directly on the substrate 10 or in the form of a package having the light emitting element 20.

In the present invention, the light emitting device 20 can emit at least one of blue, red, green, white, and ultraviolet (UV), and preferably emits white light for illumination. The light emitting device 20 may be arranged in one of a horizontal type chip, a vertical type chip, and a flip chip type. The light emitting element 20 may include a phosphor layer on the LED chip. According to the embodiment, the light emitting device 20 may include a warm white having a color temperature of 4000K or less, a cool white having a color temperature of 6500K or more, a neutral white having a mid- Neutral White or Pure White.

In the present invention, a plurality of light emitting devices 20 may be disposed on the substrate 10. The plurality of light emitting devices 20 may include a plurality of rows and a plurality of rows in a first direction of the substrate 10 and a second direction perpendicular to the first direction, and may be disposed at equal intervals.

The distance between the light emitting devices 20 may be a pitch between the light sources of the light emitting device 20. [ Here, the pitch may be the distance between the centers of the two adjacent light emitting devices 20.

The lens unit 30 may be disposed on the plurality of light emitting devices 20. The lens unit 30 may be made of a transparent material, preferably a transparent quartz material. Accordingly, the light can be transmitted without the loss of light emitted from the light emitting element 20.

In the present invention, the lens unit 30 may be divided into an incident surface 30a through which light emitted from the light emitting device 20 is incident and an exit surface 30b through which incident light is diffused.

According to the present invention, the incident surface 30a of the lens unit 30 may be a flat surface, and the exit surface 30b may be formed with arcuate protrusions 33 that can widely spread light. Further, the projections 33 formed on the emitting surface 30b preferably have a hemispherical shape, so that the light can spread more widely.

In the present invention, the exit surface 30b of the lens portion 30 can perform haze processing so that the projections 33 can be formed. As described above, when the exit surface 30b of the lens portion 30 is subjected to the haze treatment, the light emitted from the light emitting element 20 is prevented from being emitted only in the vertical direction, and the effect of diffusing and spreading light is increased.

Accordingly, it is possible to prevent the occurrence of lattice unevenness caused by the plurality of light emitting devices 20 arranged at the same interval, to improve the light efficiency by making the brightness uniform, and to increase the light emitted from the light emitting element 20 in all directions The number of the optical sheets and the number of the light emitting elements 20 of the lighting apparatus 100 can be reduced. Further, by reducing the number of the light emitting elements 20, it is possible to reduce the power consumption and the production cost of the lighting apparatus 100 and to thin the display apparatus using the light source unit.

A reflective member 40 may be disposed between the substrate 10 and the lens unit 30. The reflection member 40 can perform a function of reducing light loss by using a material having a high light reflectance and by reflecting light not directed to a general path to the lens unit 30 side.

According to the embodiment, the substrate 10 and the reflective member 40 may be combined in the form of a housing for accommodating the light emitting element 20. At this time, the reflecting member may be formed in a cylindrical or polygonal tubular shape. Further, the reflective member 40 may be coupled to the substrate 10 in a vertical direction, but not limited thereto, and may be coupled at an acute angle or an obtuse angle.

That is, the angle formed by the substrate 10 and the reflective member 40 may be greater than or equal to 90 degrees and less than 180 degrees. For example, the inner end surface including the light emitting element 20 of the illumination device 100 may have a shape such as a rectangular or trapezoidal shape.

Further, according to the embodiment, the shape viewed from above of the illumination device 100 may be a polygon such as a rectangle.

FIG. 2 is a view showing in detail an A region, one light emitting element and a corresponding lens portion of the illumination apparatus shown in FIG. 2, the protrusions 33 formed on the emission surface 30b of the lens unit 30 have hemispherical protrusions 33 having the same radius on one light emitting device 20 .

In the present invention, the hemispherical protrusions 33 may be arranged with a spacing distance increasing gradually in a first direction about the light emitting device 20 and in a second direction perpendicular to the first direction. Thus, the entire illumination device 100 can provide uniform light to such an extent that the individual luminous means 20 can not be grasped by the naked eye.

In the present invention, hemispherical protrusions 33 are defined as scattering particles generated by performing the haze treatment on the emission surface 30b of the lens unit 30. Depending on the embodiment, the haze treatment may be performed in a physical or chemical manner, such as sanding treatment, bead treatment, and the like.

FIG. 3 is a photograph showing an internal light emitting element and an external lens of the lighting apparatus of the present invention, and FIG. 4 is an enlarged view of a region B shown in FIG. Referring to FIGS. 3 and 4, a plurality of light sources may be disposed at uniform intervals in the illumination device 100. [ In this case, the B region may exist as a pattern with one light emitting device 20 and the protrusions 33 of the exit surface 30b of the lens portion 30 corresponding thereto.

The protrusions 33 of the lens unit 30 disposed on one light emitting device 20 form orthogonal coordinates X and Y in the first direction and the second direction, ≫ and Equation (2) can be satisfied.

&Quot; (1) "

& Quot; (2) "

In this case, i, j is a first direction and a unit vector in the second direction, A, B, C, D , E, F, G, H, P, and Q is a pattern interval factor, Nix and Niy is a And the number of the projections 33 arranged in the first direction and the second direction with respect to the center of the light emitting element 20.

In the present invention, preferably, the illuminating device 100 may have twelve projections 33 arranged in a first direction and a second direction around one light emitting device 20. That is, the values of Nix and Niy are 12, and the equation of the Cartesian coordinates can be defined as follows.

&Quot; (3) "

&Quot; (4) "

4 may be arranged so as to satisfy Equation (3) and Equation (4). Accordingly, the illumination device (100) can prevent the light emitted from one light emitting device 1 direction and the second direction. Also, this can be applied irrespective of the distance between the light source and the lens, and the distance between the pre-illuminator 100 and the diffusing surface or the irradiating surface.

5 is a graph showing a change in luminance distribution according to a pattern of the lighting apparatus of the present invention. 5, the luminance distribution according to the roughness of the exit surface 30b of the lens portion 30 in the entire region of the illumination device 100 of the projections 33 having the pattern of FIG. 4 is as shown in Table 1 below .

Haze
A
B
C
D

Rz (占 퐉)
0.66
0.30
0.16
0.135

The roughness (Rz) value can be measured and calculated with a 10-point average roughness using the difference between the average height of five highest peaks and the average depth of five deepest valleys in the section curve with respect to the exit surface.

According to the embodiment, the surface roughness value may be 0.1 占 퐉 to 0.15 占 퐉 in the region of the emission surface 30b where the light emitted from one light emitting device 20 satisfies Equations (3) and (4) have. In the present invention, when a roughness value is formed within such a range, a desired reflection or refraction performance can be achieved with respect to a pattern formed on the emission surface 30b, and uniform light can be realized.

However, referring to [Table 1], as the surface roughness value decreases, the brightness at the center portion decreases. However, in the present invention, as the protrusions of the emission surface form a pattern, the luminance characteristic can be improved .

Further, according to the present invention, hemispherical protrusions 33 are formed at 0.2 Mu m to 0.3 Lt; RTI ID = 0.0 > um. ≪ / RTI > Preferably, the hemispherical projections 33 may have a radius of 0.27 mu m and, with this radius, it may be easy to manufacture the illumination device 100 having a surface roughness value in the range of 0.1 mu m to 0.15 mu m , So that a more uniform illumination device 100 can be provided.

In the present invention, the value of the surface roughness is 0.135 mu m. Thus, when the lighting device 100 of the present invention is combined with a device having a large area, unevenness due to the linearity of the light emitting devices 20 is not generated, It is possible to provide one light.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: Lighting device
10: substrate
20: Light emitting element
30:
30a: incidence surface 30b: emergence surface
33: projection
40: reflective member

Claims (7)

Board;
A plurality of light emitting elements arranged on the substrate;
A lens unit disposed on the plurality of light emitting devices; And
A reflective member disposed between the substrate and the lens unit; / RTI >
The lens unit includes:
A plurality of hemispherical protrusions having the same radius on one light emitting element,
The hemispherical projections
A light emitting element disposed at a center of the substrate,
And the first and second directions are spaced apart from each other in a first direction and a second direction perpendicular to the first direction. The method according to claim 1,
The lens unit includes:
Wherein the pattern of the hemispherical projections
Forming orthogonal coordinates (X, Y) in the first direction and the second direction,
Wherein the rectangular coordinate satisfies Equation (1) and Equation (2).
&Quot; (1) "

& Quot; (2) "

Here, i and j are unit vectors in the first direction and the second direction,
Wherein A, B, C, D, E, F, G, H, P and Q are pattern spacing coefficients,
The Nix and the Niy,
The number of protrusions arranged in the first direction and the second direction with respect to the center of the one light emitting element. The method according to claim 1,
The lens unit includes:
And the roughness (Rz) value of the surface is from 0.1 mu m to 0.15 mu m. The method according to claim 1,
The hemispherical projections
And a radius of 0.2 mu m to 0.3 mu m. The method according to claim 1,
The lens unit includes:
Wherein an incident surface through which light emitted from the light emitting device is incident is a flat surface. The method according to claim 1,
The light-
In the first and second directions,
Wherein the plurality of light emitting devices have mutually different spacing distances. The method according to claim 1,
Wherein the light emitting element emits white light.

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