TW201510434A - Light emitting diode illuminating device - Google Patents

Abstract

An LED illuminating device includes a reflecting cover and a plurality of LED light sources located in the reflecting cover. The reflecting cover defines an opening. The reflecting cover includes an inner surface, an outer surface and a top surface connecting the inner surface with the outer surface. The inner surface is a reflecting surface. The plurality of LED light sources are received in the opening and closed to the top surface. Light emitted from the plurality of LED light sources is reflected out of the LED illuminating device by the inner surface. The reflecting cover is made of material with high thermal conductivity.

Description

Light-emitting diode lighting device

The invention relates to a lighting device, in particular to a lighting diode lighting device.

Compared with the conventional light source, the Light Emitting Diode (LED) has the advantages of light weight, small volume, low pollution and long life, and has been widely used as a new light source. In various fields, such as street lamps, traffic lights, signal lights, spotlights and decorative lights. However, in the application process, the light-emitting diode has a light-emitting angle of generally 120°, and the light-collecting effect is not good.

In view of this, the present invention aims to provide a light-emitting diode lighting device having a better light collecting effect.

A light-emitting diode lighting device includes a reflector and a plurality of light-emitting diode light sources disposed in the reflector, the reflector is formed with an opening, the reflector has an inner surface, an outer surface, and the inner surface and the outer surface are connected a top surface of the surface, the opening is formed on the inner side of the top surface, the inner surface is a reflective surface, and the plurality of light emitting diode light sources are disposed at the opening and near the inner side of the top surface, and the light emitting diode emits light The light is reflected by the inner surface and exits out of the light-emitting diode illumination device, which is made of a highly thermally conductive material.

The present invention provides a reflector, the light emitted by the plurality of light-emitting diode sources is reflected by the reflector and then emitted to the outside to achieve a concentrating effect; and the reflector is made of a metal material, and the LED is illuminated. The device achieves better heat dissipation without the need for additional heat sinks, thus reducing costs.

1‧‧‧Lighting diode lighting device

10‧‧‧reflector

11‧‧‧ openings

12‧‧‧ inner surface

13‧‧‧ outer surface

14‧‧‧ top surface

20‧‧‧Lighting diode source

21‧‧‧ first surface

22‧‧‧ second surface

30‧‧‧Fixed blocks

1 is a plan view of a light-emitting diode lighting device of the present invention.

2 is a partial view of the light-emitting diode lighting device of FIG. 1 taken along line II-II.

3 is a cross-sectional view of an inner surface of a reflector of the light-emitting diode lighting device of FIG. 2.

4 is a light intensity effect diagram of the light-emitting diode lighting device shown in FIG. 1.

FIG. 5 is another light intensity effect diagram of the light emitting diode lighting device shown in FIG. 1. FIG.

As shown in FIG. 1 and FIG. 2, a light-emitting diode lighting device 1 according to an embodiment of the present invention includes a reflector 10, a plurality of LED light sources 20 disposed in the reflector 10, and the plurality The light emitting diode source 20 is fixed to the fixed block 30 on the reflector 10.

The reflector 10 is symmetrical along the axis OO' and has a substantially U-shaped cross section. The reflector 10 has an opening 11 formed on one side of the plurality of LED light sources 20. The reflector 10 has an inner surface 12, an outer surface 13 and a top surface 14 connecting the inner surface 12 and the outer surface 13. The inner surface 12 and the outer surface 13 are aspherical, the top surface 14 has a toroidal surface, and the top surface 14 has an inner diameter D. The inner surface 12 is a reflecting surface, and the light emitted by the plurality of light emitting diode light sources 20 is reflected by the inner surface 12 and then emitted to the outside through the opening 11. Preferably, the reflector 10 is made of a highly thermally conductive material, such as a metal material, so that the heat transfer effect of the reflector 10 is better, thereby improving the heat dissipation performance of the LED lighting device 1.

The fixing block 30 is disposed at the opening 11 of the reflector 10 and abuts against the inner surface 12 of the reflector 10. In the present embodiment, the fixing block 30 has a substantially triangular cross section.

The plurality of light emitting diode light sources 20 are fixed to the inner side of the top surface 14 of the reflector 10 by the fixing block 30. The plurality of light emitting diode light sources 20 are symmetrically disposed along the axis OO'. Each of the light-emitting diode sources 20 abuts against the fixed block 30, and its bottom end abuts against the inner surface 12 of the reflector 10, and the tip is inclined toward the side close to the axis OO'. Each of the light emitting diode sources 20 has a first surface 21 and a second surface 22 opposite to each other. In this embodiment, the first surface 21 faces the inside of the reflector 10 as a light-emitting surface, and the angle between the first surface 21 and the plane of the top surface 14 of the reflector 10 is θ, and the second surface 22 is closely attached. Fixed block 30. In this embodiment, the LED light source 20 is a light emitting diode package structure. Of course, the LED light source 20 can also be an LED die having an electrical functional connection. In addition, when 0 < θ ≦ 45 °, it is detected that the luminous flux of the illuminating diode device 1 is high, and the optical loss is small.

It can be understood that the number of the plurality of light emitting diode light sources 20 can be appropriately increased or decreased to achieve the purpose of controlling the luminous flux of the light emitting diode illumination device 1. When the number of the light emitting diode light sources 20 is increased, the luminous flux of the light emitting diode lighting device 1 is also increased, thereby increasing the uniformity of light emission of the light emitting diode lighting device 1.

Referring to FIG. 3, in the embodiment, the cross section of the inner surface 12 of the reflector 10 is a non-circular line, and the non-circular line satisfies the following relationship:

Where ρ is the level distance from the aspheric axis; sag(ρ) is the vertical distance corresponding to ρ; r is the radius of curvature of the aspherical vertex A; c is the conic constant; d is the fourth-order aspheric correction coefficient. And preferably, -1<c≦0, -D/2≦ρ≦D/2, -0.1≦d≦0.1.

If ρ = D/2 = 37.5mm, c = 0, r = 38mm, d = 0, please refer to Figure 4, which is the light-emitting diode when the detection distance is L = 1000mm and the detector size is 2000mm*2000mm. The light intensity effect diagram of the body lighting device 1. It can be seen that the light intensity in the middle of the detector is significantly higher than the light intensity around it, and the light collecting effect of the light-emitting diode lighting device 1 is greatly improved.

If ρ = D/2 = 37.5mm, c = -1, r = 1mm, d = 0, please refer to Figure 5, which is the detection distance L = 1000mm, the detector size is 2000mm * 2000mm when the light is two The light intensity effect diagram of the polar body illumination device 1. It can be seen that the light intensity in the middle of the detector is significantly higher than the light intensity around it, and the light collecting effect of the light-emitting diode lighting device 1 is greatly improved. However, the center of the detector has a dark area, which causes the uniformity of the light in the illumination area to be poor, and the shape of the reflector 10 is too long, and the manufacturing difficulty is greatly increased, and the space occupied is also large, which cannot achieve the purpose of simplifying the device.

Therefore, preferably, r should satisfy the following relationship: 1 < r ≦ D. If r>D, the condensing effect will be deteriorated. If r<1, the top of the inner surface 12 of the reflector 10 is too sharp, which causes an increase in difficulty in production and a decrease in yield.

The present invention provides a reflector 10, and the light emitted by the plurality of LED light sources 20 is reflected by the reflector 10 and then emitted to the outside to achieve a concentrating effect. Further, the reflector 10 is made of a heat conductive material. The LED illumination device 1 can achieve better heat dissipation without using an additional heat sink, thereby reducing manufacturing costs.

It should be noted that the above-described embodiments are merely preferred embodiments of the present invention, and those skilled in the art can make other changes within the spirit of the present invention. All changes made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

no

1‧‧‧Lighting diode lighting device

10‧‧‧reflector

11‧‧‧ openings

12‧‧‧ inner surface

13‧‧‧ outer surface

14‧‧‧ top surface

20‧‧‧Lighting diode source

21‧‧‧ first surface

22‧‧‧ second surface

30‧‧‧Fixed blocks

Claims (9)

A light-emitting diode lighting device comprising a reflector and a plurality of light-emitting diode light sources disposed in the reflector, wherein the reflector is formed with an opening, the reflector has an inner surface, an outer surface, and a connection a top surface of the inner surface and the outer surface, the opening is formed on the inner side of the top surface, the inner surface is a reflective surface, and the plurality of light emitting diode light sources are disposed at the opening and near the inner side of the top surface, the light emitting diode The light emitted by the body light source is reflected by the inner surface and is emitted outside the light emitting diode illumination device. The light-emitting diode lighting device of claim 1, wherein the reflector is made of a thermally conductive material. The illuminating diode illuminating device of claim 1, wherein the inner surface and the outer surface are aspherical surfaces, and the top surface is a torus. The illuminating diode illuminating device of claim 3, wherein the reflector is an axisymmetric structure having a U-shaped cross section, and the plurality of illuminating diodes are uniformly disposed along a circumference of the top surface, each The bottom end of the light emitting diode light source abuts against the inner surface of the reflector, the top end is inclined toward the side of the symmetry axis of the reflector, and each of the light emitting diodes has a first surface and a second surface. The first surface is a light exiting surface and faces the interior of the reflector. The illuminating diode illuminating device of claim 1 or 4, wherein an angle between the first surface and a plane of the top surface of the reflector is θ, and 0<θ≦45 °. The illuminating diode illuminating device according to claim 1, wherein the inner surface of the reflector has a non-circular line along a symmetry axis, and the non-circular line satisfies the following relationship. :

Where ρ is the level distance from the aspherical axis; sag(ρ) is the vertical distance corresponding to ρ; r is the radius of curvature of the aspherical vertex; c is the conic constant; d is the fourth-order aspheric correction coefficient. The illuminating diode illuminating device of claim 6, wherein the top surface has an inner diameter D, wherein -1<c≦0, -D/2≦ρ≦D/2, -0.1≦ d≦0.1. The illuminating diode lighting device of claim 7, wherein 1 < r ≦ D. The illuminating diode illuminating device of claim 1, further comprising a fixing block for fixing the plurality of illuminating diode light sources to the reflector, the fixing block being disposed at the opening of the reflector And abutting against the inner surface of the reflector, the plurality of light emitting diode sources are in close contact with the fixing block.