ILLUMINATION DEVICE

• US 20120033404A1
• Filed: 10/11/2011
• Published: 02/09/2012
• Est. Priority Date: 08/03/2010
• Status: Active Grant

• Current Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Original Assignee: Lite-On Technology Corporation, Silitek Electronic Company Limited (Lite-On Technology Corporation)
• Inventors: WU, CHIA-HAO, WU, CHUN-CHANG
• Granted Patent: US 8,299,489 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• 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: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

An illumination device includes a base, a light-emitting module, a first layer, and a second layer. The light-emitting module is disposed on the base for generating a progressive-type light-emitting intensity. The first layer encapsulates the light-emitting module. The second layer encloses the first layer. The second layer has a progressive-type thickness corresponding to the progressive-type light-emitting intensity, and both the progressive-type light-emitting intensity and the progressive-type thickness are decreased or increased gradually, thus the progressive-type light-emitting intensity can be transformed into the same light-emitting intensity through the progressive-type thickness of the second layer.

Claims

1. An illumination device, comprising:

a base;

a light-emitting module disposed on the base for generating a progressive-type light-emitting intensity;

a first layer encapsulating the light-emitting module; and

a second layer enclosing the first layer, wherein the second layer has a progressive-type thickness corresponding to the progressive-type light-emitting intensity, both the progressive-type light-emitting intensity and the progressive-type thickness are decreased or increased gradually, and the progressive-type light-emitting intensity is transformed into the same light-emitting intensity through the progressive-type thickness of the second layer.

2. The illumination device of claim 1, wherein the light-emitting module includes at least one optoelectronic component disposed on a centric position of the base, the progressive-type light-emitting intensity generated by the at least one optoelectronic component is a function of θ

defined by I(θ

)=I₀ cos θ

, and the progressive-type thickness of the second layer is a function of θ

defined by d(θ

)=cI₀ cos θ

, wherein θ

is a light-emitting angle of the at least one optoelectronic component relative to a vertical center line vertically passing through a center point of the at least one optoelectronic component, I₀ is a maximum light-emitting intensity generated by the at least one optoelectronic component, and c is a constant number.

3. The illumination device of claim 2, wherein the at least one optoelectronic component is covered with the first layer, and the first layer is covered with the second layer, wherein the first layer is one of a transparent layer, a translucent layer, and an air layer, and the second layer is a phosphor layer formed by dispersing a phosphor powder with a plurality of phosphor particles into polymer resin.

4. The illumination device of claim 2, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the at least one optoelectronic component is covered with the first layer, the second layer is separated from the first layer to form an air layer between the first layer and the second layer, and the second layer is a phosphor layer having a phosphor powder with a plurality of phosphor particles.

5. The illumination device of claim 1, wherein the light-emitting module includes a plurality of optoelectronic components disposed on the base, the progressive-type light-emitting intensity generated by the light-emitting module is a function of θ

defined by

6. The illumination device of claim 5, wherein the optoelectronic components are covered with the first layer or respectively covered with a plurality of encapsulating units of the first layer, and the first layer is covered with the second layer, wherein the first layer is one of a transparent layer, a translucent layer, and an air layer, and the second layer is a phosphor layer having a phosphor powder with a plurality of phosphor particles.

7. The illumination device of claim 5, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the optoelectronic components are covered with the first layer or respectively covered with a plurality of encapsulating units of the first layer, and the second layer is separated from the first layer to form an air layer between the first layer and the second layer, and the second layer is a phosphor layer formed by mixing a phosphor powder having a plurality of phosphor particles with polymer resin.

8. An illumination device, comprising:

a base;

a light-emitting module disposed on the base for generating a progressive-type light-emitting intensity;

a first layer encapsulating the light-emitting module; and

a second layer enclosing the first layer and having a phosphor powder, wherein the second layer has a progressive-type concentration of the phosphor powder corresponding to the progressive-type light-emitting intensity, both the progressive-type light-emitting intensity and the progressive-type concentration of the phosphor powder are decreased or increased gradually, and the progressive-type light-emitting intensity is transformed into the same light-emitting intensity through the progressive-type concentration of the phosphor powder in the second layer.

9. The illumination device of claim 8, wherein the light-emitting module includes at least one optoelectronic component disposed on the base and directly under a topmost point of the first layer, the progressive-type light-emitting intensity generated by the at least one optoelectronic component is a function of θ

defined by I(θ

)=I₀ cos θ

, and the progressive-type concentration of the phosphor powder is a function of θ

defined by D(θ

)=cI₀ cos θ

, wherein θ

is a light-emitting angle of the at least one optoelectronic component relative to a vertical center line vertically passing through a center point of the at least one optoelectronic component, I₀ is a maximum light-emitting intensity generated by the at least one optoelectronic component, and c is a constant number.

10. The illumination device of claim 9, wherein the at least one optoelectronic component is covered with the first layer, and the first layer is covered with the second layer, wherein the first layer is one of a transparent layer, a translucent layer, and an air layer.

11. The illumination device of claim 9, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the at least one optoelectronic component is covered with the first layer, and the second layer is separated from the first layer to form an air layer between the first layer and the second layer.

12. The illumination device of claim 8, wherein the light-emitting module includes a plurality of optoelectronic components disposed on the base, the progressive-type light-emitting intensity generated by the light-emitting module is a function of θ

defined by

13. The illumination device of claim 12, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the optoelectronic components are covered with the first layer or respectively covered with a plurality of encapsulating units of the first layer, and the second layer is separated from the first layer to form an air layer between the first layer and the second layer, wherein the first layer is one of a transparent layer, a translucent layer, and an air layer.

14. An illumination device, comprising:

a base;

a light-emitting module disposed on the base and electrically connected to the base for generating a progressive-type light-emitting intensity;

a first layer encapsulating the light-emitting module; and

a second layer enclosing the first layer and having a phosphor powder with a plurality of phosphor particles, wherein the second layer has a progressive-type particle radius of the phosphor powder corresponding to the progressive-type light-emitting intensity, the progressive-type light-emitting intensity varies inversely as the progressive-type particle radius of the phosphor powder, and the progressive-type light-emitting intensity is transformed into the same light-emitting intensity through the progressive-type particle radius of the phosphor powder in the second layer.

15. The illumination device of claim 14, wherein the light-emitting module includes at least one optoelectronic component disposed on the base and directly under a topmost point of the first layer, the progressive-type light-emitting intensity generated by the at least one optoelectronic component is a function of θ

defined by I(θ

)=I₀ cos θ

, and the progressive-type particle radius of the phosphor powder in the second layer is a function of θ

defined by

16. The illumination device of claim 15, wherein the at least one optoelectronic component is covered with the first layer, and the first layer is covered with the second layer.

17. The illumination device of claim 15, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the at least one optoelectronic component is covered with the first layer, and the second layer is separated from the first layer to form an air layer between the first layer and the second layer, wherein the first layer is one of a transparent layer, a translucent layer, and an air layer.

18. The illumination device of claim 14, wherein the light-emitting module includes a plurality of optoelectronic components disposed on the base, the progressive-type light-emitting intensity generated by the light-emitting module is a function of θ

defined by

19. The illumination device of claim 18, further comprising:

a holder module being one of a tube holder and a bulb holder for supporting the base, wherein the optoelectronic components are covered with the first layer or respectively covered with a plurality of encapsulating units of the first layer, and the second layer is separated from the first layer to form an air layer between the first layer and the second layer.

20. An illumination device, comprising:

a base;

a light-emitting module including at least one optoelectronic component disposed on the base for generating a first light having a progressive-type light-emitting intensity;

an encapsulation layer encapsulating the at least one optoelectronic component; and

a phosphor layer with a phosphor powder enclosing the encapsulation layer and having a progressive-type structure in correlation with the progressive-type light-emitting intensity, wherein the progressive-type structure is one of a progressive-type thickness, a progressive-type concentration of the phosphor powder, and a progressive-type particle radius of the phosphor powder, and the first light passes through the phosphor layer to generate a second light having the same light-emitting intensity.