BRIGHTNESS IMPROVING STRUCTURE OF LIGHT-EMITTING MODULE WITH AN OPTICAL FILM SURFACE LAYER

• US 20100308709A1
• Filed: 11/30/2007
• Published: 12/09/2010
• Est. Priority Date: 11/30/2007
• Status: Active Grant

• Current Assignee: Jenn-Wei Mii
• Original Assignee: Jenn-Wei Mii
• Inventors: MII, Jenn-Wei
• Granted Patent: US 8,368,294 B2
• Time in Patent Office: Days
• US Class Current: 313/485
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 3/10 characterised by coatings
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01J 61/35 provided with coatings on the walls thereof; Selection of materials for the coatings using coloured coatings H01J61/40; using luminescent coatings H01J61/42
• CPC Class Codes: H01J 61/38 Devices for influencing the colour or wavelength of the light

Abstract

A brightness improving structure of a light-emitting module with an optical film surface layer 12, wherein a light-emitting part 20 is provided inside a transparent envelop 10 and may emit ultraviolet or blue light, the said transparent envelop 10 has first wall and second wall, first inside wall 101 and second inside wall 103 are oppositely formed inside thereof, first outside wall 102 and second outside wall 104 are oppositely formed outside thereof. The first wall is partly or entirely provided with the optical film coating 12, the optical film coating 12 may at least reflect the ultraviolet or blue light exciting fluorescent/phosphorescent light, and may pass light rays comprising visible light. A visible light layer or both the visible light layer and a reflective layer are provided on the second wall, and the said light-emitting part 20 is placed at a setting location from the envelop 10.

Claims

1. A brightness improving structure of a light-emitting module with an optical thin-film surface layer, characterized in that said structure comprising:

a transparent envelop shaped as a hollow sphere and having a first wall and a second wall opposite to the first wall, said first wall having a first inside wall surface and a first outside wall surface, said second wall adjoining said first wall and having a second inside wall surface and a second outside wall surface;

an optical thin-film which being a non-omni angular multiple layers film and having a long wave pass light filter function, and being coated on the first wall surface of the transparent envelop over 30% of its area, said optical thin-film reflecting light rays at least comprising ultraviolet or blue light exciting a fluorescent/phosphorescent layer and at least comprising visible light source which being in the long-wave band of visible wave length, and running through to emit;

a light-emitting part shaped as a spherical area arranged in the transparent envelop for emitting ultraviolet or blue light; and

a visible light layer formed of the fluorescent/phosphorescent layer, said visible light layer being coated on the second wall surface of the transparent envelop for exciting the ultraviolet or blue light into visible light source.

2. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 1, characterized in that:

the distance c between an any point A of the reflecting layer of said optical thin-film and a center of sphere B of the light-emitting part should meet the following relationship;

c≧

cscα

×

r, wherein r being the radius of the light-emitting part, a being the incidence angle at the point A of the reflecting layer of said optical thin-film, a connection line of A and B being the normal of the reflection angle at point A, and b being the distance projecting to tangential point of the periphery circumference of the light-emitting part from the point A of the reflecting layer.

3. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 1, characterized in that:

said light-emitting part being an ultraviolet or blue light luminescent tube arranged in the light-emitting part in form of rotation-wound, the inside wall surface of said luminescent tube being partially coated with a fluorescent/phosphorescent layer.

4. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 3, characterized in that:

the inside lower wall surface of said luminescent tube forming a straight wall surface coated with the fluorescent/phosphorescent layer.

5. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 3, characterized in that:

said transparent envelop being a partial sphere, which having an arc spherical surface and a bottom thereof interconnecting with each other, said first wall is arranged on the arc spherical surface of the partial sphere and said second wall is arranged on the bottom of the envelop.

6. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 5, characterized in that:

at least a part of the light-emitting part being a partial sphere whose arc spherical surface is opposite to the arc spherical surface of the transparent envelop.

7. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 1, characterized in that:

said structure further providing with a reflective lampshade shaped as a hemisphere with a radius, at least a hemisphere transparent envelop being provided therein, said radius being not less than the diameter of the transparent envelop, and the extension line of the bottom of the hemisphere-shaped transparent envelop being positioned at the center of sphere of the reflective lampshade and an any point on the lampshade wall, preferably at the center of sphere of the reflective lampshade and the center point.

8. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to any one of the claims 1 to 7, characterized in that:

the thickness of the fluorescent/phosphorescent layer of said visible light layer is 60 to 1000 μ

m.

9. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 8, characterized in that:

the incidence angle α

is 0 to 60°

, preferably 0 to 15°

.

10. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 9, characterized in that:

the second wall of the transparent envelop being coated with a reflective layer at the outside of the visible light layer.

11. A brightness improving structure of a light-emitting module with an optical thin-film surface layer, characterized in that said structure comprising:

a transparent envelop shaped as a hollow sphere and having a first wall and a second wall opposite to the first wall, said first wall having a first inside wall surface and a first outside wall surface, said second wall adjoining said first wall and having a second inside wall surface and a second outside wall surface;

a optical thin-film being non-omni angular multiple layers film and having a long wave pass light filter function, and being coated on the first wall surface of the transparent envelop over 30% of its area, said optical thin-film at least reflecting light rays containing ultraviolet or blue light exciting a fluorescent/phosphorescent layer and light rays at least comprising visible light source which being in the long-wave band of visible wave length and running through to emit

a light-emitting part shaped as a spherical area arranged in the transparent envelop for emitting ultraviolet light;

said light-emitting part being an LED arranged in said light-emitting region for emitting ultraviolet or blue light at least; and

a visible light layer formed of the fluorescent/phosphorescent layer, said visible light layer being coated on the second wall surface of the transparent envelop for exciting the ultraviolet or blue light into visible light source.

12. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 11, characterized in that:

the distance c between an any point A of the reflecting layer of said optical thin-film and a center of sphere B of the spherical light-emitting part should meet the following relationship;

c≧

cscα

×

r, wherein r is the radius of the light-emitting part, a being the incidence angle at the point A of the reflecting layer of said optical thin-film, a connection line of A and B being the normal of the reflection angle at point A, and b being the distance projecting to tangential point of the periphery circumference of the light-emitting part from the point A of the reflecting layer.

13. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 11, characterized in that:

said transparent envelop being a partial sphere, which having an arc spherical surface and a bottom thereof interconnecting with each other, said first wall is arranged on the arc spherical surface of the partial sphere and said second wall is arranged on the bottom of the envelop.

14. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 13, characterized in that:

at least a part of the light-emitting part being a partial sphere whose arc spherical surface is opposite to the arc spherical surface of the transparent envelop.

15. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to any one of the claims 11 to 14, characterized in that:

the thickness of the fluorescent/phosphorescent layer of said visible light layer is 60 to 1000 μ

m.

16. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 15, characterized in that:

the incidence angle α

is 0 to 60°

, preferably 0 to 15°

.

17. The brightness improving structure of the light-emitting module with the optical thin-film surface layer according to claim 16, characterized in that:

the second wall of the transparent envelop being coated with a reflective layer at the outside of the visible light layer.