KR20140076847A - LED Lamp apparatus - Google Patents

Abstract

An LED lighting device according to an embodiment of the present invention includes a printed circuit board in which a plurality of LED light sources is mounted in a plurality of concentric circles; a first spacer which is disposed at the upper side of the printed circuit board; a first diffusion member which is installed at the upper side of the first spacer; a second spacer which is disposed on the upper side of the first diffusion member; and a second diffusion member which is disposed on the upper side of the second spacer. The plurality of LED light sources is characterized in that light from the light source installed around the center is weaker than light from the light source arranged on the edge part.

Description

LED lamp apparatus

To an LED lighting apparatus of the present invention.

In general, a light emitting diode (LED) is a device that bonds a p-type semiconductor and an n-type semiconductor, and emits light while coupling electrons and holes at the junctions. These LEDs can be used for home appliances, remote control, electric signboards, and various automation devices because they can irradiate high efficiency light with low voltage, and they are applied to various lighting devices because they are environment friendly, have excellent durability and long life. Due to the above-described characteristics of the LED, an illumination device such as an incandescent lamp or a fluorescent lamp which is conventionally used is being replaced by a lighting device using an LED.

An LED element used as a light source of an LED lighting apparatus is made by a surface mount device (SMD) method for directly mounting on a printed circuit board (PCB) Are arranged and combined. The PCB is mounted on a lighting device body of a predetermined shape and installed in a lighting case.

Korean Patent Publication No. 10-2011-0113093 (October 14, 2011)

An object of the present invention is to provide an LED illumination device having a brightness uniformity of 99% or more in a field of view or more of a camera module so as to accurately determine the optical center of the camera module.

According to an aspect of the present invention, there is provided an LED lighting device including: a printed circuit board having a plurality of LED light sources mounted in a plurality of concentric circles; A support member installed on a bottom surface of the printed circuit board to support the printed circuit board and to perform a heat radiation function; A first spacer disposed on the printed circuit board; A first diffusion member provided on the first spacer; A second spacer disposed on the upper side of the first diffusion member; And a second diffusion member disposed on the second spacer, wherein the plurality of LED light sources are arranged such that the light of the light source disposed near the center of the light source arranged at the rim portion is weakly adjusted.

The LED light source includes a first LED disposed in the center; A plurality of second LEDs spaced a first distance from the first LED; A plurality of third LEDs spaced a second distance from the first LED; And a plurality of fourth LEDs spaced a third distance from the first LED.

Wherein the first to fourth LEDs are formed to have the same size.

The ratio of the first distance to the second distance and the third distance may be 1: 2: 3.

The brightness of the light of the first to third LEDs may be 30 to 50% of the brightness of the light of the fourth LEDs, and the brightness of the light of the first to third LEDs may be 40% As shown in FIG.

At this time, the brightness of light of the first to third LEDs can be controlled to be equal to each other.

The first spacer may have a reflection surface on the inner circumferential surface, and the reflection surface may have a Raman scattering property of 10 to 50%.

The first and second spacers may be formed in a cylindrical shape.

The height of the first spacer may be higher than the height of the second spacer.

The thickness of the first diffusion member may be greater than the thickness of the second diffusion member.

The first diffusion member may be formed of a diffusion plate, and the second diffusion member may be formed of a diffusion sheet.

The plurality of LED light sources are arranged in a circular shape and the brightness of the light source in the vicinity of the center and the brightness of the light source disposed in the outer edge side are different from each other, It is possible to provide an LED lighting device having a uniformity of 99% or more in an area over the viewing angle of the module.

1 is a cross-sectional view schematically showing an example of an LED lighting apparatus according to an embodiment of the present invention,
Figure 2 is a schematic plan view of Figure 1,
FIG. 3 is a view showing different brightness areas of an LED lighting apparatus according to an embodiment of the present invention, FIG.
4 and 5 are graphs showing brightness performance of the LED lighting apparatus according to the related art,
6 and 7 are graphs showing brightness performance of an LED lighting apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic plan view of FIG. 1; and FIG. 3 is a cross-sectional view of the LED lighting apparatus according to an embodiment of the present invention. FIGS. 4 and 5 are graphs showing the brightness performance of the LED lighting apparatus according to the related art, and FIGS. 6 and 7 are graphs showing the brightness of the LED lighting apparatus according to an embodiment of the present invention. This is a graph showing performance.

1, an LED illumination apparatus according to an embodiment of the present invention includes a support member 10, an LED light source 11, a first spacer 20, a first diffusion member 30, (40) and a second diffusion member (50).

The support member 10 supports the printed circuit board 10a on which the LED light source 11 is mounted and is formed of a metal material and discharges the heat of the printed circuit board 10a to the outside The LED lighting device according to the embodiment of the present invention may include the printed circuit board 10a on which the LED light source 11 is mounted, the LED light source 11, A spacer 20, a first diffusion member 30, a second spacer 40, and a second diffusion member 50.

The LED light source 11 is mounted on the upper side of the printed circuit board 10a, and a plurality of LED light sources 11 may be arranged in a circle as shown in FIG.

According to an embodiment of the present invention, a first LED 11a is disposed at the center, and a second LED 11b is disposed around an imaginary circle of a first diameter centered on the first LED 11a. A third LED 11c is arranged around an imaginary circle of a second diameter centering on the first LED 11a and a third LED 11c having a fourth diameter centered on the first LED 11a And the fourth LED 11d may be disposed around the imaginary circle.

In the above-described embodiment, a total of four LED light sources 11 are disposed. However, the number of the LED light sources 11 may be increased or decreased according to the size of the light source.

An object of the present invention is to improve the uniformity of generated light. To achieve this, the brightness of the LED light source 11 may be adjusted by adjusting the brightness of the first to fourth LEDs 11a to 11d to be different from each other .

That is, according to an embodiment of the present invention, the brightness of the first to third LEDs 11a to 11c is adjusted in the same manner, and the brightness of the fourth LED 11d is controlled by the brightness of the first to third LEDs 11a 11c). At this time, the brightness of the fourth LED 11d may be maximized. The brightness of the first LED 11a through the third LED 11c may be about 10% to 50% of the brightness of the fourth LED 11d. Brightness can be obtained. 3, if the brightness of the fourth LED 11d is 100%, the brightness of the region S1 corresponding to the rim portion can be made the brightest, and the brightness of the first to third The brightness of the region S2 in which the LEDs 11a to 11c is provided can be controlled to be darker than the brightness of the S1 region. According to an embodiment of the present invention, the brightness of the first to fourth LEDs 11a to 11d may be controlled such that the brightness of the S1 region is 100% and the brightness of the S2 region is 40%.

According to an embodiment of the present invention, the first LED 11a may be disposed at the center, but it is not limited thereto, and two or more LEDs may be disposed. A plurality of the second LEDs 11b may be disposed on the circumference of a virtual circle having a radius spaced a certain distance from the first LEDs 11a, have.

A plurality of third LEDs 11c may be disposed on the circumference of a virtual circle having a radius that is twice the distance between the first LEDs 11a and the second LEDs 11b, 18 can be arranged so as to be equally spaced from each other.

A plurality of the fourth LEDs 11d may be disposed on the circumference of a virtual circle having a radius that is three times the distance between the first LED 11a and the second LED 11b, 18 can be arranged so as to be equally spaced from each other.

The first spacer 20 forms an upper space portion of the LED light source 11 and may have a predetermined height H1. A reflective surface 21 is formed on the inner surface of the first spacer 20 to reflect the light of the LED light source 11 and to maintain the brightness of the light uniform as much as possible. % ≪ / RTI > reflectance. In addition, the reflective surface 21 may have a lambertian scattering property of 10 to 50%. The first spacer 20 may be formed of a cylindrical member such as a barrel.

The first diffusion member 30 may be disposed on the upper surface of the first space 20 to distribute the light of the LED light source 11 uniformly. The first diffusion member 30 may be formed of a diffusion plate. The diffusing plate diffuses light emitted from the LED light source 11 along the surface to make the color and brightness uniform throughout the screen, and may be formed of a translucent material. The first diffusion member 30 may be formed of PET or PC.

The second spacer 40 may be disposed on the first diffusion member 30 and may have a predetermined height H2 and a second diffusion member 50 may be provided on the second spacer 40 . The second spacer 40 may be spaced apart from the first and second diffusion members 30 and 50 by a predetermined distance to scatter light passing through the second spacer 40 to a maximum extent to form uniform light. The height H 2 of the second spacer 40 may be smaller than the height H 1 of the first spacer 20.

The second diffusion member 50 may be formed of the same material as the first diffusion member 30 or may be formed of a different material. And can be varied according to the necessity of selecting the material. The second diffusion member 50 plays a role of scattering light of the LED light source 11 and making it uniform, like the first diffusion member 30. The second diffusion member 50 may be formed of the same diffusion plate as the first diffusion member 30 or may be a diffusion sheet.

The first spacer 20 and the second spacer 40 may have different heights. According to an embodiment of the present invention, the height of the first spacer 20 may be greater than the height of the second spacer 40 As shown in Fig. According to this configuration, light is scattered by the light reflected by the reflection surface 21 formed on the inner circumferential surface of the first spacer 20, so that brightness of light can be uniformly and uniformly formed.

In the case of the first diffusion member 30 and the second diffusion member 50, the thickness of the first diffusion member 30 is made thicker, and in the first diffusion member 30 formed to be relatively thick, The second diffusing member 50 is formed to be relatively thinner than the first diffusing member 30 and the transmittance of light passing therethrough can be increased.

4 and 5 are graphs showing brightness performance of the LED lighting apparatus according to the related art. As shown in the figure, in the case of a conventional test light source, it was necessary to arrange the light source to be as close as possible to the camera module in order to obtain 99% uniformity, and to use it at a very short distance of about 5 to 6 mm.

However, as shown in FIG. 6 and FIG. 7, the LED lighting apparatus according to the embodiment of the present invention can achieve 99% uniformity even when the distance from the camera module to be tested is 21 mm, have.

According to the present invention, in consideration of the fact that the light scattering phenomenon is larger at the edge of the light according to the characteristics of the LED illumination, the light of the LED light source at the rim portion is more strongly formed, and the LED light source near the center is relatively It is possible to uniformly form the light of the illumination device by making a slight adjustment.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10; A support member 10a; Printed circuit board
11; LED light source 11a; The first LED
11b; A second LED 11c; Third LED
11dl fourth LED 20; The first spacer
30; A first diffusion member 40; The second spacer
50; The second diffusion member

Claims (14)

A printed circuit board on which a plurality of LED light sources are mounted in a plurality of circles;
A first spacer disposed on the printed circuit board;
A first diffusion member provided on the upper side of the first spacer,
A second spacer disposed on the upper side of the first diffusion member; And
And a second diffusion member disposed above the second spacer,
Wherein the plurality of LED light sources are arranged such that the light of the light source disposed in the vicinity of the center of the light source arranged at the rim is weakly adjusted.
The method according to claim 1,
And a support member installed on a bottom surface of the printed circuit board to support the printed circuit board and to perform a heat radiation function.
The LED light source according to claim 1,
One first LED disposed centrally;
A plurality of second LEDs spaced a first distance from the first LED;
A plurality of third LEDs spaced a second distance from the first LED; And
And a plurality of fourth LEDs spaced a third distance from the first LED.
The method of claim 3,
Wherein the ratio of the first distance to the second distance and the third distance is 1: 2: 3.
The method of claim 3,
Wherein the brightness of the light of the first to third LEDs is 30 to 50% of the brightness of the light of the fourth LED.
6. The method of claim 5,
The brightness of the light of the first to third LEDs is 40% of the brightness of the light of the fourth LEDs.
6. The method of claim 5,
Wherein the brightness of the first to third LEDs is formed to be equal to each other.
The method of claim 3,
Wherein the first to fourth LEDs are formed to have the same size.
2. The device of claim 1, wherein the first spacer comprises:
An LED lighting device having a reflective surface on an inner peripheral surface.
10. The projection exposure apparatus according to claim 9,
An LED lighting device having a 10% -50% Raman cyan scattering characteristic.
The method according to claim 1,
Wherein the first and second spacers are formed in a cylindrical shape.
The method according to claim 1,
Wherein a height of the first spacer is higher than a height of the second spacer.
The method according to claim 1,
Wherein the thickness of the first diffusion member is thicker than the thickness of the second diffusion member.
The method according to claim 1,
Wherein the first diffusion member is formed of a diffusion plate,
And the second diffusion member is formed of a diffusion sheet.

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