CN101963323B - Reflector and LED packaging structure using same - Google Patents

Abstract

The invention relates to a reflector comprising an inner wall for reflecting light emitted by a light source, the curved surface equation of the inner wall being as follows:

wherein c is₁Is the height of the reflector; the light source is arranged at the bottom of the reflector and emits light rays throughThe inner wall of the reflector reflects and then emits. The invention improves the utilization rate of light, compresses the light energy to the actually required target area by controlling the light emergence angle range, effectively improves the light intensity of the target area, and can be used in the illumination field or the display field.

Description

Reflector and use the LED encapsulating structure of this reflector

Technical field

The present invention relates to a kind of reflector and use the LED encapsulating structure of this reflector.

Background technology

At present, the encapsulating structure that in LED demonstration and lighting field, uses is made up of the shell structure and the casting glue of LED wafer, LED encapsulation; Wherein have light hole on the shell structure of LED encapsulation, this light hole is circular " horn mouth " shape, and casting glue is filled in horn mouth inside; The LED wafer is fixed on the printed circuit board (PCB), and is positioned at circle " horn mouth " bottom of shell structure.Do not have optical design in this LED encapsulating structure, also do not add reflector or optical lens, the light that the LED wafer sends directly shines in the air through casting glue.Because the LED wafer of a plurality of different glow colors of integrated encapsulation can not be placed on the same position, thereby on different angles, can be shown as various colors, because of aberration produces the uneven problem of colour mixture.In order to realize that colour mixture is even; Existing method is in casting glue, to add light scattering agent, but the method can make out luminous intensity former thereby cause bigger decay because of increasing light path, total reflection, light absorption and scattering etc., and light emission rate is lower; And rising angle is uncontrollable; Its rising angle is 180 degree solid angles, and in the actual demand, does not need the light emitting region of 180 degree solid angles.The angular field of view that general human eye vision requires in the horizontal direction is far longer than the angular field of view on the vertical direction, and therefore existing this encapsulating structure has considerable light energy to be not used in the target area.

Summary of the invention

The technical problem that the present invention will solve provides a kind of light utilization efficiency height, the controlled reflector of rising angle.

In order to solve the problems of the technologies described above, reflector of the present invention comprises and is used for the inwall that the light to light emitted reflects that the surface equation of this inwall is following:

$\left\{\begin{array}{c}x=(\frac{z}{c_1}\×(a_1-a_2)+a_2)\×\cos \left(t\right)\\ y=(\frac{z}{c_1}\×(b_1-b_2)+b_2)\×\sin \left(t\right);t\∈\left(\mathrm{0,2}\mathrm{\π}\right),z\∈(0,c_1)\\ z=z\end{array}\right.$

C wherein ₁Height for reflector; Curved surface is at z=c ₁The closed curve that is projected as with on two faces of z=0 is respectively first closed curve and second closed curve; a ₁, b ₁Be respectively the semiaxis of first closed curve on x direction and y direction, a ₂, b ₂Be respectively the semiaxis of second closed curve on x direction and y direction; b ₁>=b ₂, a ₁>=a ₂, and a ₁With b ₁, a ₂With b ₂Do not equate simultaneously.

Light source is positioned at the bottom (being on the face of z=0) of reflector, the outgoing after the reflection of reflector inwall of its light that sends.The present invention is because the reflector inwall has adopted the described shape of above-mentioned surface equation; Improved the utilization rate of light; And light energy is compressed to actual needed target area through control light angle of emergence scope; Improve the light intensity of target area effectively, can be used for lighting field or demonstration field.The present invention can reduce size of current, thereby reach better energy-saving effect under same brightness requires.

Said reflector inwall is coated with reflective coating.

Another technical problem that the present invention will solve provides a kind of LED encapsulating structure that uses above-mentioned reflector.

In order to solve the problems of the technologies described above, the LED encapsulating structure of the above-mentioned reflector of use of the present invention comprises led light source, the shell structure that places on the printed circuit board (PCB); Said reflector and shell structure are integrated; The reflector inwall is the inwall of the light hole on the shell structure, and led light source is positioned at the bottom of light hole.

Said led light source comprises a plurality of wafers, and each wafer is arranged in order.

Fill casting glue in the described light hole.

The present invention directly with the inwall of the light hole inwall on the shell structure of LED encapsulation as reflector, makes reflector and becoming one of shell structure structure, does not increase other assemblies such as lens, when having improved light extraction efficiency, has reduced cost effectively.In addition, because each wafer is arranged in order, make the wafer of a plurality of different colours be packaged with colour mixture effect preferably.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further explain.

Fig. 1 (a) is a reflector stereogram of the present invention.

Fig. 1 (b) is a reflector vertical view of the present invention.

Fig. 2 is reflector top and bottom shape sketch map.

Fig. 3 is the side view of reflector.

Fig. 4 is a LED encapsulating structure cutaway view of the present invention.

Fig. 5 is the light distribution of the wafer of coordinate (0,0)

Fig. 6 is the light distribution of the wafer of coordinate (0.3,0).

Fig. 7 is the light distribution of the wafer of coordinate (0.3,0).

The specific embodiment

Shown in Fig. 1 (a), 1 (b), reflector of the present invention comprises and is used for the inwall 2 that the light to light emitted reflects that the surface equation of this inwall 2 is following:

$\left\{\begin{array}{c}x=(\frac{z}{c_1}\×(a_1-a_2)+a_2)\×\cos \left(t\right)\\ y=(\frac{z}{c_1}\×(b_1-b_2)+b_2)\×\sin \left(t\right);t\∈\left(\mathrm{0,2}\mathrm{\π}\right),z\∈(0,c_1)\\ z=z\end{array}\right.$

The shape explanation:

This surface equation is at z=c ₁Be projected as closed curve on two faces of (reflector top) and z=0 (reflector bottom), be respectively first closed curve 3 and second closed curve 4:

$\left\{\begin{array}{c}x=a_1\&times;\mathrm{Cos}\left(t\right)\\ y=b_1\&times;\mathrm{Sin}\left(t\right)\end{array}\right.t\&Element;\left(\mathrm{0,2}\mathrm{\&pi;}\right)$ With $\left\{\begin{array}{c}x=a_2\&times;\mathrm{Cos}\left(t\right)\\ y={\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HDA0000025257660000011.png,HDA0000025257660000012.png"\; state="\{\{state\}\}">b</figure-callout>}}_2\&times;\mathrm{Sin}\left(t\right)\end{array}\right.t\&Element;\left(\mathrm{0,2}\mathrm{\&pi;}\right);$

Like Fig. 2, shown in Figure 3, wherein c ₁Height for reflector; a ₁, b ₁Be respectively the semiaxis of first closed curve 3 on x direction and y direction, a ₂, b ₂Be respectively the semiaxis of second closed curve 4 on x direction and y direction; b ₁>=b ₂, a ₁>=a ₂, and a ₁With b ₁, a ₂With b ₂Do not equate (promptly first closed curve and second closed curve are not circular simultaneously, and one of them is oval, and one is circular, and perhaps two all is oval) simultaneously.

Light source is positioned at the bottom (being on the face of z=0) of reflector, can be led light source or other light sources.

As shown in Figure 4, the LED encapsulating structure of the above-mentioned reflector of use of the present invention comprises led light source, the shell structure 5 that is fixed on the printed circuit board (PCB); Said reflector and shell structure 5 are integrated; Reflector inwall 2 is the inwall of the light hole 6 on the shell structure 5, and led light source is positioned at the bottom of light hole 6.

Said led light source can adopt single wafer, also can adopt the combination of a plurality of different colours wafers.Led light source shown in Fig. 4 is the wafer 11,12,13 that is arranged in three different colours of reflector bottom 4 by the level order.

Fill casting glue in the described light hole 6.

A among the following embodiment ₁, a ₂, b ₁, b ₂, c ₁Five parameter units are millimeter.

Embodiment 1:

Like Fig. 2, shown in 3, a ₁=4, b ₁=2.5, c ₁=4, a ₂=1, b ₂=1.6, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index).The coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is respectively (0.3,0), (0,0), (0.3,0).The LED angle of emergence can be controlled in 80 degree in the xz plane, and 50 degree scopes in the yz plane effectively improve light intensity more than 100%, and can be implemented in does not have the aberration phenomenon basically on the different visual angles, and colour mixture is even.Present embodiment is because angle of emergence scope is less; Be mainly used in the visual angle less demanding; The lighting field higher to brightness requirement perhaps through adding lens later in order to the higher demonstration field of display requirement, makes up the requirement that can accomplish with great visual angle through a plurality of LED wafers.

At a ₁, a ₂, b ₁, b ₂Under the situation about confirming, c ₁Value can realize controlling rising angle within the specific limits and strengthen light intensity, realizes the effect of the even no color differnece of colour mixture.

At a ₁=4, b ₁=2.5, c ₁=4, a ₂=1, b ₂Under=1.6 conditions, c ₁=3.9 o'clock, the light angle of emergence was 60 degree in the xz plane, 40 degree in the yz plane, and light intensity improves more than 100%, c ₁=3 o'clock, the light angle of emergence was 45 degree in the xz plane, 90 degree in the yz plane, and light intensity improves more than 60%.

Embodiment 2:

As shown in Figure 2, a ₁=3.25, b ₁=2.03, c ₁=1.8, a ₂=1.9, b ₂=1.19, n ₁=1, n ₂=1.59 o'clock (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0); The LED angle of emergence can be controlled in 50 degree in the xz plane, and 135 degree scopes in the yz plane effectively improve light intensity more than 60%; Can be implemented in does not have the aberration phenomenon to occur basically on the different visual angles, colour mixture is even, relatively is fit to the demonstration field.

Embodiment 3:

a ₁=4, b ₁=2.5, c ₁=1.64, a ₂=1, b ₂=0.625, n ₁=1, n ₂=1.59 o'clock (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 130 degree in the xz plane; 150 degree scopes in the yz plane, brightness improves 30%, can realize that basically colour mixture is even.

Embodiment 4:

a ₁=4, b ₁=2.5, c ₁=3.3, a ₂=1, b ₂=1, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), three wafers of red, green, blue 11,12,13 in the plane of z=0 coordinate be (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 70 degree in the xz plane; 90 degree scopes in the yz plane, brightness improves 50%, can realize that colour mixture is even.

Embodiment 5:

a ₁=4, b ₁=2.5, c ₁=3.2, a ₂=2, b ₂=1, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), three wafers of red, green, blue 11,12,13 in the plane of z=0 coordinate be (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 80 degree in the xz plane; 90 degree scopes in the yz plane, brightness improves 45%, can realize that colour mixture is even.

Embodiment 6:

a ₁=4, b ₁=2.5, c ₁=2.5, a ₂=1, b ₂=2, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 90 degree in the xz plane; 80 degree scopes in the yz plane, brightness improves 45%, can realize that colour mixture is even.

Embodiment 7:

a ₁=4, b ₁=3, c ₁=3.8, a ₂=2, b ₂=1.5, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 30 degree in the xz plane; 130 degree scopes in the yz plane, brightness improves 100%, can realize that colour mixture is even.

Embodiment 8:

a ₁=4, b ₁=3, c ₁=3.8, a ₂=2.5, b ₂=1.5, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 50 degree in the xz plane; 130 degree scopes in the yz plane, brightness improves 50%, can realize that colour mixture is even.

Embodiment 9:

a ₁=4, b ₁=4, c ₁=3.5, a ₂=2.5, b ₂=1.5, n ₁=1, n ₂=1.59 (n ₁Be air refraction, n ₂Be the casting glue refractive index), the coordinate of three wafers of red, green, blue 11,12,13 in the plane of z=0 is (0.3,0), (0; 0), (0.3,0), the LED angle of emergence can be controlled in 55 degree in the xz plane; 45 degree scopes in the yz plane, brightness improves 100%, can realize that colour mixture is even.

The light distribution that under embodiment 2 conditions, obtains is following:

When wafer position when (0,0), the light distribution in its space is as shown in Figure 5;

When wafer position when (0.3,0), the light distribution in its space is as shown in Figure 6;

When wafer position when (0.3,0), the light distribution in its space is as shown in Figure 7.

Can know that by Fig. 5, Fig. 6, Fig. 7 when these three positions, its light distribution does not have notable difference to red, green, blue wafer 11,12,13 respectively; The light distribution registration is quite high; Thereby at each rising angle, the different phenomenon of obvious color can not appear, can realize that colour mixture is even.

Under other embodiment conditions with embodiment 2 conditions under the rising angle size that records difference to some extent, but the overlapping effect of the light distribution that records is similar, the Therefore, omited.

Among the above embodiment, light intensity increase rate data all are that the reflector inwall is not carried out comparing the experimental data that obtains with the LED encapsulating structure of prior art under the coating film treatment situation.

Reflector of the present invention, in the plane of z=0, wafer is oval excessively

The center of circle and be parallel to a ₁Position distribution on the direction is not obvious to whole LED encapsulation colour mixture effect and rising angle influence, distributes in the wafer position that this side up and can realize that basically colour mixture is even, can realize that no obvious aberration occurs in the rising angle scope.

The concrete numerical value that provides in the foregoing description all is to confirm through a large amount of experiments; But the invention is not restricted to above-mentioned embodiment; So long as reflector bottom and reflector top are not circular simultaneously; When the reflector shape zooms in or out according to a certain percentage, can realize beam angle control, improve and luminous intensity; And the arrangement mode of wafer removes at a ₁On the direction by outside arranged in a straight line, also can be at b ₁By arranged in a straight line, or a plurality of wafer press triangle or the arrangement of polygonal shape, all has certain colour mixture effect, wherein at a on the direction ₁Colour mixture effect on the direction is best.

Said reflector inwall is coated with the alundum (Al reflective coating or other can play the reflective coating of reflex.

Claims (5)

1. reflector is characterized in that comprising being used for the inwall that the light to light emitted reflects, and the surface equation of this inwall is following:

$\left\{\begin{array}{c}x=(\frac{z}{c_1}\&times;(a_1-a_2)+a_2)\&times;\cos \left(t\right)\\ y=(\frac{z}{c_1}\&times;(b_1-b_2)+b_2)\&times;\sin \left(t\right);t\&Element;\left(\mathrm{0,2}\mathrm{\&pi;}\right),z\&Element;(0,c_1)\\ z=z\end{array}\right.$

C wherein ₁Height for reflector; Curved surface is at z=c ₁The closed curve that is projected as with on two faces of z=0 is respectively first closed curve and second closed curve; a ₁, b ₁Be respectively the semiaxis of first closed curve on x direction and y direction, a ₂, b ₂Be respectively the semiaxis of second closed curve on x direction and y direction; b ₁>=b ₂, a ₁>=a ₂, and a ₁With b ₁, a ₂With b ₂Do not equate simultaneously.

2. reflector according to claim 1 is characterized in that said reflector inwall is coated with reflective coating.

3. a LED encapsulating structure that uses reflector as claimed in claim 1 is characterized in that comprising the led light source, the shell structure (5) that place on the printed circuit board (PCB); Said reflector and shell structure (5) are integrated; Reflector inwall (2) is the inwall of the light hole (6) on the shell structure (5), and led light source is positioned at the bottom of light hole (6).

4. LED encapsulating structure according to claim 3 is characterized in that said led light source comprises a plurality of wafers, and each wafer is arranged in order.

5. LED encapsulating structure according to claim 3 is characterized in that filling in the described light hole (6) casting glue.

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