KR101298576B1 - A led lighting lens having a reflection surface and a led lighting device having thereof - Google Patents

Abstract

The present invention relates to a light reflecting lens and an illumination device having the same, and more particularly, to an emission surface of a light reflecting lens in order to prevent a yellow band phenomenon appearing when the light emitted from the LED module passes through the light reflecting lens. The present invention relates to a light reflecting lens having a corroded surface and a lighting device having the same.
The light reflection lens according to the present invention comprises: a first incident surface to which the front side light is incident; A second incident surface to which the ambient light is incident; An outer reflecting surface that reflects light traveling from the second incident surface into the light reflecting lens; An inner reflection surface for reflecting light emitted back into the light reflection lens; A first emission surface emitting light emitted from the first entrance surface in a front direction; And a second emission surface emitting light reflected from the outer reflection surface in a front direction; The first incident surface and the second incident surface constitute a cylindrical receiving portion, and the first emission surface and the inner reflective surface constitute a cylindrical recess.
LED lighting apparatus according to the present invention includes an LED module for emitting light; A printed circuit board on which the LED module is mounted; And a light reflecting lens package disposed above the LED module. The light reflecting lens package includes a flat part having one or more light reflecting lenses, a bent part bent in a rear direction along an edge of the flat part, and a guide protrusion coupled to a printed circuit board. It is configured by.

Description

Light reflecting lens and LED lighting device having same {A LED lighting Lens having a Reflection Surface and a LED lighting device having pretty.}

The present invention relates to a light reflecting lens and an illumination device having the same, and more particularly, to an emission surface of a light reflecting lens in order to prevent a yellow band phenomenon appearing when the light emitted from the LED module passes through the light reflecting lens. The present invention relates to a light reflecting lens having a corroded surface and a lighting device having the same.

In general, the lighting device installed indoors comprises a bracket installed on the wall, the ceiling, and the like and a light source fixed to the bracket. Conventional incandescent bulbs and fluorescent lamps are mainly used as light sources, but recently, they have been gradually replaced by light emitting diodes due to excellent lifespan and light conversion efficiency.

A light emitting diode (LED) is a semiconductor device that forms a minority carrier of electrons or holes injected into a P-N junction semiconductor and emits light by recombination of these minority carriers.

There are two types of methods for obtaining white light from a light source using a light emitting diode. A red light emitting diode, a blue light emitting diode, and a yellow light emitting diode are mounted adjacent to one substrate, and a light emitting color emitted from each light emitting diode is mixed to obtain white light. This method has a disadvantage in that it is difficult to realize full white light because the circuit configuration for driving each light emitting diode is complex and the arrangement of the three primary colors may be different, and thus the color temperature is low and thus it is not applicable to lighting devices of various uses. .

Another method for obtaining white light is a method in which light emitted by a light emitting diode is mixed with light emitted by a phosphor to obtain white light. As a light emitting diode used here, a blue light emitting diode having a wavelength of 450 nm to 470 nm and a yellow phosphor such as YAG: Ce or (Ba, Sr, Ca) 2 SiO 4: Eu are used. The white light is configured such that light emitted from the blue light emitting diode excites a yellow phosphor and is obtained by mixing light of blue light and yellow light.

In this method, white light is obtained using blue light and yellow light, and green color and red light are insufficient, resulting in low color rendering. In other words, the color reproduction range is insufficient and thus it is somewhat insufficient to obtain white light close to natural light. In addition, compared to the method of obtaining white light by mixing light of three primary colors using red, blue, and green light emitting diodes, white light can be obtained by a relatively small number, which has the advantage of lowering manufacturing cost, but color temperature of light. Is very high and gives a lot of visual fatigue to the user.

Patent Publication No. 10-1046079 "White LED device and LED lighting device using the same, as shown in Figure 1, has been disclosed an illumination device with improved light efficiency and heat dissipation characteristics.

The lighting apparatus according to the prior art has a substrate provided with a reflector on one surface, an LED chip mounted on the reflector, a transparent light reflecting lens covering the LED chip, a fluorescent reflecting layer formed on the transparent reflecting lens, on the fluorescent reflecting layer And a phosphor layer having a refractive index higher than that of the fluorescent reflective layer and a light distribution reflective lens formed on the phosphor layer, wherein the light distribution reflective lens has a groove having a shape corresponding to the phosphor layer on a lower surface of the substrate. And accommodating the phosphor layer, and the side surface extending from the edge of the lower surface is formed to have a parabolic shape.

In the lighting device configured as described above, when light is emitted from the LED chip, the light collides with the fluorescent material of the phosphor layer, excites the fluorescent material distributed in the phosphor layer, and is emitted upward or directed downward. At this time, most of the light excites the fluorescent material, and the light emitted upward is incident on the reflector formed in the substrate to excite the fluorescent material and is emitted upward.

In addition, among the light excited by the generated light of the LED chip, the light toward the upper direction is emitted in the light irradiation direction together with the generated light of the LED chip to implement white light, that is, the light emitted toward the LED chip downward Is totally reflected by the fluorescent reflective layer and directed upward. In this case, among the fluorescence emitted toward the LED chip, the light totally reflected by the fluorescent reflecting layer is light incident at a critical angle or more, and is not totally reflected on the fluorescent reflecting light, and the transmitted light is reabsorbed by the LED chip or the substrate. It can be totally reflected by the reflector of the emitted in the upward direction.

However, the white light using the light emitting diode according to the prior art is refracted by the light reflecting lens mounted on the upper side of the light source, so that yellow light is generated near the edge of the light reflecting lens, and the center and the edge of the lighting apparatus have different color temperatures. You lose.

In addition, the following prior art documents exist as prior art.

Japanese Patent Laid-Open No. 2011-009055 (2011. 01.13.)

The present invention has been made to solve the above problems, and an object of the present invention is to provide a light reflecting lens for emitting white light close to natural light and an LED lighting device having the same.

In addition, it is an object of the present invention to provide a light reflecting lens and an LED lighting device having the same by improving the light output efficiency by the light alignment lens provided in the LED lighting device and the optical axis of the light emitted from the LED module to complete alignment.

A light reflecting lens according to the present invention includes a light reflecting lens provided on an upper side of an LED module for emitting front side light and peripheral side light, the first incident surface on which the front side light is incident; A second incident surface to which the ambient light is incident; An outer reflecting surface that reflects light traveling from the second incident surface into the light reflecting lens; An inner reflection surface for reflecting back light emitted into the light reflection lens; A first emission surface emitting light emitted from the first entrance surface in a front direction; And a second emission surface emitting light reflected from the outer reflection surface in a front direction; The first incident surface and the second incident surface constitute a cylindrical receiving portion, and the first emission surface and the inner reflective surface constitute a cylindrical recess portion.

In addition, a corrosion surface for preventing a yellow band is formed on the first emission surface and the second emission surface.

In addition, the first incidence surface is further provided with a recess for advancing the incident light horizontally by refraction.

LED lighting apparatus according to the present invention, the LED module for emitting light; A printed circuit board on which the LED module is mounted; And a light reflecting lens package disposed above the LED module. .

In addition, the light reflecting lens package includes a planar portion provided with one or more light reflecting lenses, a bent portion formed by being bent in a rear direction along an edge of the planar portion, and a guide protrusion coupled to a printed circuit board.

The guide protrusion may include a first cylindrical portion in which a screw is fitted, a second cylindrical portion having a small diameter, and a horizontal portion provided at an end of the first cylindrical portion and in surface contact with the printed circuit board. And an evacuation groove formed between the horizontal portion and the second cylindrical portion.

According to the light reflection lens according to the present invention, by forming a corroded surface on the first emission surface and the second emission surface of the light reflection lens, it is possible to prevent the yellow band phenomenon in all the light emitted from the light reflection lens.

In addition, since the recess is formed in the first incident surface, the light emitted by the refraction of the light may be emitted horizontally to each other.

In addition, by forming the avoidance groove formed between the horizontal portion and the second cylindrical portion provided in the guide protrusion, it is possible to prevent misalignment of the light reflection lens package by the burr that may be generated when forming the groove portion on the printed circuit board. There is an advantage to that.

1 is a cross-sectional view of a light reflecting lens for an LED lighting apparatus according to an embodiment of the present invention.
2 is a view illustrating a light reflecting lens package having no recess in the light reflecting lens according to the exemplary embodiment of the present invention.
3 is a view illustrating a rear surface of a light reflecting lens package in which at least one light reflecting lens is formed according to an embodiment of the present invention.
4 illustrates a front surface of the light reflecting lens package.
FIG. 5 illustrates that the ends of the guide protrusions of the light reflection lens package and the printed circuit board are coupled to each other.
6 is a view showing that the light reflecting lens package and the printed circuit board are coupled to each other according to an embodiment of the present invention.

Hereinafter, a light reflecting lens for an LED lighting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. 'Front side light' described in the specification means light that is emitted from the LED module to the first incident surface, and 'peripheral light' means light emitted in a direction other than the first incident surface. In addition, what is shown in the drawings may be somewhat exaggerated.

1 is a cross-sectional view of a light reflecting lens for an LED lighting apparatus according to an embodiment of the present invention.

LED lighting apparatus according to an embodiment of the present invention is a printed circuit board 100 having a wiring pattern, at least one LED module 200 is electrically connected to the wiring pattern and spaced at a predetermined interval, the at least one LED And a light reflecting lens 300 that distributes light emitted from the module.

The printed circuit board 100 has a wiring pattern for supplying electricity to one or more LED modules on one surface thereof, and an LED module is electrically connected to an end of the wiring pattern. An insulating layer for electrical short and protection of the wiring patterns is additionally formed on one surface of the printed circuit board on which the wiring patterns are formed. When electricity is supplied to the LED module, which is a light source, heat is generated together with the emitted light. Therefore, it is desirable to select a material having a relatively good thermal conductivity for the printed circuit board.

The LED module 200 includes a hemispherical resin including a light emitting diode chip emitting light therein and a phosphor formed on an upper side of the light emitting diode chip. Light generated from the light emitting diode chip passes radially through the hemispherical resin.

The light reflection lens 300 is made of a transparent material such as polymethly methacrylate (PMMA), polycarbonate (PC), and disposed above the LED module to distribute light emitted from the LED module.

Hereinafter, the light reflecting lens according to the present invention will be described in detail with reference to FIG. 1.

The light reflecting lens 300 according to the present invention includes an accommodating part 310 having a first incident surface 311 and a second incident surface 312, an outer reflecting surface 320, and a first emitting surface 331. And a recess 330 and a second emission surface 340 having an inner reflective surface 332.

The light reflecting lens has a conical shape erected from the outside, and is arranged toward the LED module on the side with the narrow circular cross section of the cone and the light emitting surface on the side with the wide circular cross section. Referring to FIG. 1, when viewed along the optical axis, an accommodating part is provided at a part where light is emitted from the LED module, and a recess is provided at a part where light is emitted through the light reflecting lens. The light emitted from the LED is incident on the first incident surface of the accommodation portion, passes through the light reflecting lens, and is emitted through the first emission surface of the recess portion.

The accommodating part 310 has a cylindrical groove inside, a front surface of the cylinder is formed with a first incident surface and a side of the cylinder has a second incident surface. Light emitted from the LED module and directed toward the first incidence plane travels parallel to the optical axis inside the light reflection lens by the first incidence plane and passes through the first exit plane to the front direction of the light reflection lens. Therefore, the first incidence surface is formed such that a recess is formed inside the light reflecting lens so that light travels horizontally by refraction inside the light reflecting lens.

The peripheral light emitted from the LED module is directed toward the inner reflective surface of the accommodating part, and passes through the inside of the light reflective lens and is reflected from the outer reflective surface to the front direction of the light reflective lens.

The outer reflecting surface 320 changes an optical path so that light emitted in an oblique direction from the LED module is directed in parallel to the front side of the light reflecting lens. For this purpose, a reflective material is coated on the outer reflective surface of the light reflecting lens. The outer reflecting surface is shaped in accordance with the light path incident on the light reflecting lens so as to have a parallel light path by reflection.

The recess 330 includes a first emission surface 331 and an inner reflection surface 332. The recess is a cylindrical groove inside, and referring to the drawing, the front surface of the cylinder is formed with a first exit surface and the side of the cylinder is formed with an inner reflective surface coated with a reflective material.

The first emission surface emits parallel light traveling from the first entrance surface in the front direction. Here, the center of the receiving portion and the groove portion along the optical axis emitted from the LED module. The first incidence surface of the accommodation portion and the first emission surface of the recess portion are formed in the same area and are provided to be concavely opposed in a cylindrical shape from the front side and the rear side of the light reflection lens to the inside.

Peripheral light emitted from the LED module is reflected by the outer reflecting surface, which is reflected back from the inner reflecting surface and is emitted in the front direction.

According to the light reflecting lens according to the present invention, the front side light emitted from the LED module is emitted to the first exit surface through the first incident surface, and the peripheral light emitted from the LED is reflected at the outer reflecting surface and again the light It is reflected from the inner reflective surface inside the reflective lens and exits in the front direction.

In addition, the depth of the cylindrical shape consisting of the first emission surface and the inner reflective surface constituting the cylinder can be adjusted according to the light distribution of the light emitted to the desired second emission surface.

2 is a view illustrating a light reflecting lens package having no recess in the light reflecting lens according to the exemplary embodiment of the present invention.

Referring to the drawings, when the light reflecting lens package is separated from the mold, the light reflecting lens package is thermally contracted. It can be seen that the most severely deformed by the heat is the portion where the first emission surface from which light is finally emitted is formed. Referring to the drawings, the thermal contraction is lowered to some extent in the light reflecting lens inward direction when viewed from the side. The light emitted from the LED module is changed due to the lowered portion, making it difficult to achieve the desired light effect by design. Therefore, by forming a recess in a portion where the first exit surface is formed, it is possible to prevent deformation of the light reflection lens package due to thermal contraction.

The second emission surface 340 is a peripheral area excluding a recess, which is a center portion of the light reflection lens. That is, the light emitted from the LED module passes through the light reflecting lens and is finally emitted to the first emission surface and the second emission surface.

The light reflecting lens configured as described above collects the front side light emitted from the LED module by the first incident surface and the first exit surface, and emits the peripheral side light emitted from the LED module by the outer reflecting surface and the inner reflecting surface. It spreads widely and emits from the second exit surface, so that the viewer divides light emitted from the LED module into a central part and a peripheral part.

In the present invention, the second emission surface is formed as an embodiment, but can be formed as an aspherical surface having a certain curvature, such as required to achieve the required light effect.

On the other hand, the light reflecting lens according to the present invention undergoes a corrosion treatment to prevent the yellow band. The yellow band is generated from the light passing through the light reflecting lens in the LED module and generally refers to a phenomenon in which yellow light appears.

The corrosion treatment is formed on the first emission surface and the second emission surface where the light emitted from the LED module passes through the light reflection lens and finally exits. The corrosion treatment may be formed by using chemical corrosion on the mold core during the mold of the light reflecting lens, or by applying sanding corrosion. The scattering of the light is performed by the corrosion treatment and the light emitted from the light reflecting lens can remove the yellow band phenomenon.

If the corroded surface formed by the corrosion treatment is formed on the outer reflecting surface or the inner reflecting surface, an accurate optical path change cannot be obtained. In order to precisely control the angle of the optical path, the outer reflecting surface and the inner reflecting surface can accurately implement the reflecting means such as the inclination, and there is an advantage that the total reflection can be made by the high gloss surface.

3 is a view illustrating a rear surface of a light reflection lens package in which one or more light reflection lenses are formed, and FIG. 4 is a front view of the light reflection lens package.

The light reflecting lens package 400 according to the present invention includes a flat part 410 having one or more light reflecting lenses, a bent part 420 and a printed circuit board formed by being bent in a rear direction along an edge of the flat part. It is configured to include a guide protrusion 430 is coupled.

In the light reflection lens package according to the present invention, referring to FIGS. 3 and 4, at least one light reflection lens is disposed at a predetermined interval on one side in a circular shape. The LED module mounted on the printed circuit board is correspondingly coupled to the receiving portion of each light reflecting lens.

In addition, a guide protrusion for screwing the printed circuit board is formed at the edge of the planar portion of the light reflection lens package. After arranging the light reflecting lens package corresponding to each LED module on the printed circuit board, the screw is rotated to fix the printed circuit board and the light reflecting lens package to each other.

Hereinafter, the guide protrusion provided in the light reflecting lens package according to the present invention will be described with reference to FIGS. 5 to 6.

FIG. 5 illustrates that the end of the guide protrusion of the light reflecting lens package and the printed circuit board are coupled to each other, and FIG. 6 is a light reflecting lens package according to the embodiment of the present invention. A diagram showing that a printed circuit board is coupled to each other.

The guide protrusion 430 is provided at the end of the first cylindrical portion 431, the second cylindrical portion 432 having a smaller diameter than the first cylindrical portion, the first cylindrical portion is screwed and the printed circuit board And a horizontal portion 433 in contact with the surface and an evacuation groove 434 formed between the horizontal portion and the second cylindrical portion.

In the printed circuit board according to the exemplary embodiment, the groove 110 is formed to correspond to the guide protrusion of the light reflecting lens package, so that the light reflecting lens package is aligned with the LED module mounted on the printed circuit board. Is done.

Referring to FIG. 6, a minute burr may be generated when the groove is formed in the printed circuit board. As a result, when the light reflecting lens package is coupled to the printed circuit board, accurate alignment is not performed by the burr, so that the optical float and the light distribution characteristics emitted from the LED module may be changed.

The burr formed at the end of the groove portion of the printed circuit board is interposed in the avoidance groove formed in the guide protrusion, so that the light reflecting lens package and the printed circuit board can be accurately combined.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

100: printed circuit board 110: groove
200: LED module 300: light reflection lens
310: accommodating part 311: first incident surface
312: second incident surface 320: outer reflective surface
330: groove 331: first exit surface
332: inner reflection surface 340: second exit surface
400: light reflection lens package 410: flat portion
420: bend portion 430: guide protrusion
431: first cylindrical portion 432: second cylindrical portion
433: horizontal portion 434: evasion groove
burr: burr

Claims (6)

In the light reflection lens provided on the upper side of the LED module for emitting the front light and the peripheral light,
A first incident surface to which the front side light is incident;
A second incident surface to which the ambient light is incident;
An outer reflecting surface that reflects light traveling from the second incident surface into the light reflecting lens;
An inner reflection surface for reflecting back light emitted into the light reflection lens;
A first emission surface emitting light emitted from the first entrance surface in a front direction; And
A second emission surface emitting light reflected from the outer reflection surface in a front direction;
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The first incidence surface and the second incidence surface constitute a cylindrical accommodating portion, and the first emission surface and the inner reflective surface constitute a cylindrical recessed portion,
The first exit surface and the second exit surface is formed with a corrosion surface to prevent the yellow band
Light reflecting lens characterized in that.
delete The method according to claim 1,
The first reflection surface is a light reflection lens, characterized in that further provided with a recess for advancing the incident light horizontally by refraction.
LED module for emitting light;
A printed circuit board on which the LED module is mounted; And
A light reflecting lens package having one or more light reflecting lenses according to claim 1 disposed on an upper side of the LED module;
LED lighting apparatus, characterized in that configured to include.
The light reflecting lens package of claim 4, wherein the light reflecting lens package includes a flat part provided with at least one light reflecting lens, a bent part bent in a rear direction along an edge of the flat part, and a guide protrusion coupled to a printed circuit board. LED lighting device, characterized in that configured to.
6. The method of claim 5,
The guide protrusion
A first cylindrical portion into which the screw is fitted,
A second cylindrical portion having a diameter smaller than the first cylindrical portion,
And an evacuation groove formed between an end portion of the first cylindrical portion and a horizontal portion in surface contact with the printed circuit board and between the horizontal portion and the second cylindrical portion.

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