WO2014094349A1

WO2014094349A1 - Led packaging structure

Info

Publication number: WO2014094349A1
Application number: PCT/CN2013/001209
Authority: WO
Inventors: 郑天航
Original assignee: 欧普照明股份有限公司
Priority date: 2012-12-17
Filing date: 2013-10-08
Publication date: 2014-06-26
Also published as: CN103872210A; CN103872210B

Abstract

A semiconductor light-emitting element packaging structure, comprising a hollow spherical shell (1), at least one light source (3), and at least one light outlet (7); the inner side of the shell is covered with a diffuse reflection layer (2) having a reflexivity greater than 92%; each light source (3) is fixedly disposed inside the shell (1) via a light source fixing base (4); the light source (3) is not in the center of the spherical shell (1); a connecting line from a point on the inner surface of the spherical shell (1) having the highest luminous flux density formed by a single light source (3) to the light source (3) is defined as an optical axis of the single light source (3); the number of optical axes equals the number of points having the highest luminous flux density; the light outlet (7) is disposed on the surface of the shell (1), and is configured not to intersect with any optical axis of any light source (3), such that most of the light emitted by the light source will radiate out from the light outlet only after being reflected at least once by the diffuse reflection layer. The present invention effectively improves the overall efficiency of a device, and improves light emitting effect while reducing unit luminous flux cost and preventing glare.

Description

LED package structure

The present invention relates to a package structure of a semiconductor lighting device (LED or OLED, etc.), and more particularly to a spherical package structure.

Background technique

In LED components, it is important to improve the luminous efficiency of LED devices, which not only helps reduce component costs, but also saves power and reduces the need for thermally conductive materials. In the current package structure of LED components, there is basically a planar structure as shown in Figure 1, including LED chips, phosphors, and reflector cups. The light emitted by the LED components still has some or not coming out of the chip. It is either self-absorbed by the LEDs after being emitted. At the same time, the directionality of the emitted light is also difficult to control. In the end, a lot of light cannot be utilized, and finally the light-emitting device itself wastes energy.

In order to improve the light extraction efficiency, some people try to place the LED chip in a transparent sphere or hemisphere. For example, US Patent No. 2008/0121918 uses an approximately spherical package structure to improve the light extraction efficiency, compared with the planar package structure. The efficiency is further improved, but in these structures, the emitted light is emitted from all directions of the sphere, and the direction of illumination is poorly controllable, and finally, even through the secondary reflecting means, it cannot be effectively utilized, thereby reducing the overall light output. effectiveness.

Summary of the invention

In order to solve the problem that the above-mentioned package structure has low light-emitting efficiency and poor controllability of the light-emitting direction, the present invention provides a spherical package structure.

The present invention solves the above technical problem, and the technical solution adopted is to provide a package structure, including:

a hollow spherical housing, the inner side of the housing is covered with a diffuse reflection layer having a reflectivity greater than 92%; at least one light source, each light source is fixedly disposed inside the housing through a light source fixing base; At least one light exit opening is disposed on a surface of the housing, and the package structure provides illumination to the outside via the light exit opening.

Optionally, the light source is not in the center of the spherical shell.

Optionally, defining a point at which a maximum value of a luminous flux density formed by a single light source on an inner surface of the spherical housing is to an optical axis of the single light source, the number of optical axes being equal to a luminous flux density The number of maximum points, the light exit port is configured to have no intersection with any of the optical axes of any of the light sources.

Optionally, the light exit port is further configured with a substrate containing a phosphor.

Optionally, the phosphor is a remote phosphor.

Optionally, the light exit port is further configured with an optical component, wherein the optical component is at least one of a filter, a diffuser, and a polarizer, or a combination of at least two

Optionally, the light exit port is further configured with a secondary light distribution structure.

Optionally, the secondary light distribution structure is an optical scattering cover.

Optionally, the optical diffusing cover comprises a cone, a semi-conical shape, a cylindrical shape, a sphere or a hemisphere.

Optionally, an inner baffle is further disposed on an inner side of the outer casing of the light exit opening, and the inner baffle has a height that is much smaller than a radius of the spherical spherical shell, and at most one of the radius of the spherical spherical shell /3, the inner baffle surface is covered with a diffuse reflection layer having a reflectance greater than 92%.

Optionally, the inner baffle is disposed perpendicular to the surface of the housing.

Optionally, the at least one light source is an LED or an LED.

Optionally, the diffuse reflection layer is a coating of a high reflectivity material, and the reflectivity material may be barium sulfate (BaS04), magnesium oxide (MgO) or polytetrafluorohexene suspension resin coating. .

The present invention adopts the above technical solution, so that compared with the prior art, the overall efficiency of the device can be effectively improved, the light-emitting effect can be improved, and the cost per unit luminous flux can be reduced. The light from the light source is reflected multiple times in the sphere, which can effectively collect all the light from the light source and change the light. The distribution density achieves the uniformity of illumination of the optimized light source, thereby achieving the purpose of eliminating glare. At the same time, at the light exit end of the spherical package, a planar phosphor component, or a light filter, or a light-scattering sheet can be used, so that the light emitted by the LED having a shorter wavelength can be uniformly converted into white light through the remote phosphor structure. Or other colors, or other wavelengths of light, such as green, red, yellow, etc.

DRAWINGS

1 is a schematic view of a prior art package structure

2 is a schematic view of a package structure of Embodiment 1

3 is a schematic diagram of a package structure of Embodiment 2

4 is a schematic diagram of a package structure of Embodiment 3

Figure 5 is a schematic diagram of the distribution of the light source and the light exit port

6 is a schematic diagram of a light source and a light outlet according to a preferred embodiment.

FIG. 7 is a schematic diagram of a light source and a light outlet according to a preferred embodiment.

Figure 8 is a diagram showing the luminous flux density distribution of two different types of light sources on the inner surface of a spherical shell.

The package structure proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

2, 3, and 4 are three preferred embodiments of the present invention, FIG. 2 is a first embodiment, FIG. 3 is a second embodiment, and FIG. 4 is a third embodiment. The package structure provided by the present invention can be seen from the figure. Including a hollow spherical housing 1 , the inner side of the housing 1 is covered with a diffuse reflection layer 2 having a reflectivity greater than 92%; at least one light source 3, in the first embodiment and the second kind, a single light source, in the third embodiment For a plurality of light sources, each of the light sources 3 is fixedly disposed inside the casing 1 through the light source fixing base 4. Defining the point at which the maximum value of the luminous flux density formed by the light source 3 on the inner surface of the spherical casing 1 is to the optical axis of the light source 3, the light source 3 may be an LED, depending on the LED The luminous flux density distribution on the surface of the sphere will have different forms. Please refer to Figure 8 which may be Lambert as shown in Figure 8A. In the light type, the maximum luminous flux is densely present in the middle, then the line connecting the light source to this point is the optical axis ζι, and in Fig. 8B, the maximum luminous flux is densely present on both sides, in this case there are two optical axes Z2. . In these several embodiments, the light source is a Lambertian LED with its optical axis passing through the center of the spherical housing 1. On the surface of the spherical housing 1, at least one light exit port 7 is further provided. In the first embodiment and the second type, a single light exit port is provided. In the third embodiment, the light exit ports 7 are configured as There is no intersection of any of the optical axes of a light source, so that most of the light emitted by the light source 3 is reflected from the light exit port 7 after being reflected by at least one of the diffuse reflection layers. The light b emitted from the light source 3 parallel to the optical axis is reflected from the light exit port 7 after being reflected by the diffuse reflection layer 2 at least once. The light rays &, b, c in all directions emitted by the light source 3 change the light distribution density by sufficient reflection inside the sphere, and finally all the light is emitted from the light exit port 7, and the light coming out from the light exit port 7 has removed the glare portion. Subsequent reticle design brings convenience.

The light source used in the three preferred embodiments is an LED component, which may select a bare LED chip, a packaged LED device, or an array of LED components, and may be employed in other preferred embodiments. A 0 LED or a semiconductor laser element or the like is used as a light source. As shown in FIG. 2, FIG. 3, and FIG. 4, the light source fixing base 4 can be disposed through the housing 1, and the heat sink 6 is connected to the outer end of the housing for heat dissipation, and is powered by the power connection line 5.

The light exit port 7 can be provided without any optical device as shown in the first embodiment. In another preferred embodiment, the light exit port 7 can be provided with a substrate containing a remote phosphor for achieving luminous efficiency, wavelength and color. Adjustment.

Embodiment 2 On the basis of the first embodiment, as shown in FIG. 3, an inner baffle 11 is further disposed on the inner side of the casing 1 around the light exit port 7, and the inner baffle 11 is covered with a layer of reflectivity greater than 95%. The reflective layer, the inner baffle 11 blocks the light emitted at a specific angle, and further prevents glare from occurring. The height of the inner baffle 11 is much smaller than the radius of the casing 1. In the present embodiment, the radius of the casing 1 is 1/5. In the present embodiment, the filter 9 is sequentially disposed in the light exit port 7, and the diffuser 10 is provided. And the reticle 8, the filter 9 can block the light of a specific wavelength range from being emitted, and the diffusing plate 10 scatters the emitted light. For example, the mask 8 may be a semi-conical diffuser having a narrow inner width and a wide angle, and the light exit direction may be changed according to the angle of the corner (the angle between the side of the semi-conical body and the ground), or the mask 8 Other shapes of diffuser covers may be selected, such as cylindrical, hemispherical, spherical, and the like. The photomask 8 as a secondary light distribution element can also be replaced by other lenses that change the angle of the light. Of course, the optical device including the phosphor-containing substrate, the filter, the diffusion plate, the lens, the polarizer, and the photomask may be used alternatively or in combination. In other preferred embodiments, the filter may be combined with the photomask. It may also be a phosphor substrate in combination with a diffusing plate, or a phosphor substrate, a filter in combination with an optical lens.

The third embodiment shows a structure of a multi-light source and multiple light exit ports. As shown in FIG. 4, there are three light sources 3 and two light exit ports 7, and a light guide 8 is disposed outside the light exit port 7. The distribution of the light exit and the light source can be randomly distributed as shown in Fig. 5, but a specific constraint must be met, that is, there is no intersection between any of the light exit ports 101 and the optical axis of any of the light sources 102 in the package structure.

In a preferred embodiment, the distribution of the light exit port and the light source is as shown in FIG. 6. A plurality of light sources 201, in this embodiment, five in the same plane, and uniformly distributed in the plane and the spherical shell intersect. On the circumference of the housing, the light exit port 202 is disposed on the vertical line of the plane of the housing to the plane of the light source, and meets the above specific restrictions. The light exit port 202 may be in the same hemisphere as the light source 201, or may be in different hemispheres. In other embodiments, 201 may be used as a light exit port, and 202 is a light source design.

In another preferred embodiment, the plurality of light sources 201 are on the same plane, and are concentratedly distributed on a circular arc of the circumference formed by the intersection of the plane and the spherical shell, and the shell surface has a plurality of such arcs containing the light source. The setting of the light exit port satisfies the aforementioned specific restrictions.

In a preferred embodiment, the distribution of the light exit port and the light source is as shown in FIG. 6. The plurality of light sources 301a, 301b are on the first plane and uniformly distributed on the circumference formed by the intersection of the first plane and the spherical shell. The plurality of light sources 301c are on the second plane and uniformly distributed on the circumference formed by the intersection of the second plane and the spherical shell, and the plurality of light exits 302 are on the third plane and uniformly distributed in the third plane and the sphere On the circumference generated by the intersection of the housings, the first plane, the second plane, and the third plane are parallel, and the distribution of the light exit 302 and the light sources 301a, 301b, 301c meets the aforementioned specific restrictions, and the light is emitted. The mouth can be in the same hemisphere as the light source, or it can be in a different hemisphere. In this embodiment, the light sources 301a, 301b, 301c are respectively three different colored LED chips. In other embodiments, a light source of a first wavelength may be disposed in a first plane and a light source of a second wavelength may be disposed in a second plane to achieve a light mixing effect.

In the present invention, the reflection of light in the casing is diffuse reflection, and the realization is through a diffuse reflection layer having a reflectance of more than 92%. When the reflectance is greater than 92%, sufficient reflection of the light in the casing can be ensured, of course, reflection The higher the rate, the less waste of light energy, so a highly reflective coating with a higher reflectivity can be selected as the diffuse reflection layer. The coating can be selected to use high-purity barium sulfate (BaS04) with a reflectance of 96%~ Between 99%, magnesia (MgO) is 97% or polytetrafluorohexene suspension resin (abbreviated as F4) has a reflectance of 98% to 99% and other materials with high reflectivity.

The above description of the preferred embodiments of the present invention is intended to be illustrative and not restrictive It is obvious to those skilled in the art that it should be included within the scope of the invention as defined by the appended claims.

Claims

Rights request

A package structure comprising:

a hollow spherical housing, the inner side of the housing is covered with a diffuse reflection layer having a reflectivity greater than 92%;

At least one light source, each light source is fixedly disposed inside the casing through a light source fixing base; at least one light exit port is disposed on a surface of the casing, and the package structure provides illumination to the outside through the light exit port.

2. The package of claim 1 wherein the light source is not in the center of the spherical housing.

3. The package structure according to claim 1, wherein a point at which a maximum value of a luminous flux density formed on a surface of the spherical housing is formed by a single light source to a line connecting the light source is the single light source The optical axis, the number of optical axes being equal to the number of maximum points of the luminous flux density, and the light exiting opening is configured to have no intersection with any of the optical axes of any of the light sources.

4. The package structure according to claim 1, wherein the light exit port is further provided with a substrate containing a phosphor.

5. The package of claim 4 wherein the phosphor is a remote phosphor.

The package structure according to claim 1, 2, 3, 4 or 5, wherein the light exit port is further provided with an optical component, wherein the optical component is a filter, a diffusion sheet, and a polarizer. At least one of, or a combination of at least two.

7. The package structure according to claim 6, wherein the light exit port is further provided with a secondary light distribution structure.

8. The package of claim 7 wherein the secondary light distribution structure is an optical diffuser.

9. A package structure according to claim 8 wherein the optical diffuser cover comprises a cone, a semi-conical shape, a cylindrical shape, a sphere or a hemisphere.

10. The package structure according to claim 1, wherein an inner baffle is further disposed on an inner side of the outer periphery of the light exit opening, and the height of the baffle is much smaller than a radius of the spherical outer casing, at most For 1/3 of the radius of the spherical shell, the inner baffle surface is covered with a diffuse reflective layer having a reflectance greater than 92%.

11. The package of claim 10 wherein said inner baffle is disposed perpendicular to said housing surface.

12. The package of claim 1 wherein the at least one light source is an LED or an OLED.

13. The package structure according to claim 1, wherein the diffuse reflection layer is a coating of a high reflectivity material, and the reflectivity material may be barium sulfate (BaS04), magnesium oxide. (MgO) or polytetrafluorohexene suspension resin coating.