LIGHT CONVERSION SUBSTRATE AND LIGHT EMITTING PACKAGE AND AUTOMOBILE LAMP INCLUDING THE SAME

• US 20150233546A1
• Filed: 02/13/2015
• Published: 08/20/2015
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: PARK, Jin Gyeong, KIM, Won Jin, LEE, In Jae
• Granted Patent: US 9,810,402 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/153 arranged in a matrix
• CPC Class Codes: F21S 41/155 Surface emitters, e.g. organic light emitting diodes [OLED]
• CPC Class Codes: F21S 41/16 Laser light sources
• CPC Class Codes: F21S 41/176 Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
• CPC Class Codes: F21S 41/30 characterised by reflectors
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil

Abstract

Provided are a light conversion substrate intended for converting an excited beam into a conversion beam, and a light emitting package including the light conversion substrate, the light conversion substrate being implemented in a structure in which side parts of the light conversion substrate for converting a beam emitted from a light emitting element are formed to have different tapers so that uniform color distribution can be implemented all over the entire surface of the light conversion substrate upon packaging the light conversion substrate with the light emitting element.

Claims

1. A light conversion substrate, comprising:

a first side part that forms a first taper; and

a second side part formed in one region of the light conversion substrate and having a second taper different from the first taper

wherein the light conversion substrate contains a fluorescent material.

2. The light conversion substrate of claim 1, wherein the second side part has a curvature in a central direction of the light conversion substrate.

3. The light conversion substrate of claim 2, wherein the second taper is larger than the first taper.

4. The light conversion substrate of claim 3, wherein the first taper has an angle of 30°

or less, and the second taper has an angle of 30°

or more,

where the first taper is defined as a taper angle formed by the first side part and a vertical segment taken from a lower end point of the first side part to a vertical upper direction, and

the second taper is defined as a taper angle by an extension line of an upper end and a lower end of the second side part having a curvature and a vertical segment of the lower end.

5. The light conversion substrate of claim 4, wherein the second side part is inwardly curved from an edge portion of the light conversion substrate to a central direction of a central portion.

6. The light conversion substrate of claim 5, wherein the second side part is configured such that at least two second side parts are provided.

7. The light conversion substrate of claim 5, which contains a phosphorescent and fluorescent material.

8. The light conversion substrate of claim 5, which contains at least one of a yellow phosphor, a green phosphor and a red phosphor.

9. The light conversion substrate of claim 8, wherein the yellow phosphor is any one of a silicate-based phosphor and a YAG based-phosphor, and the green phosphor is any one of a silicate-based phosphor, a nitride-based phosphor and a sulfide-based phosphor, and the red phosphor is any one of a nitride-based phosphor and a sulfide-based phosphor.

10. A light emitting package, comprising:

a light emitting unit emitting an excited beam; and

a light conversion substrate of claim 1 disposed in an optical path of the excited beam,

wherein the light emitting unit and the light conversion substrate are spaced apart from each other.

11. The light emitting package of claim 10, further comprising an adhesive member disposed between the light emitting unit and the light conversion substrate.

12. The light emitting package of claim 10, wherein the light conversion substrate comprises a first side part that forms a first taper;

and a second side part formed in one region of the light conversion substrate and having a second taper different from the first taper, wherein the first taper has an angle of 30°

or less, and the second taper has an angle of 30°

or more,

where the first taper is defined as a taper angle formed by the first side part and a vertical segment taken from a lower end point of the first side part to a vertical upper direction, and

the second taper is defined as a taper angle by an extension line of an upper end and a lower end of the second side part having a curvature and a vertical segment of the lower end.

13. The light emitting package of claim 12, wherein a position where the second side part provided at an edge portion of the light conversion substrate is inwardly curved corresponds to a connection terminal of the light emitting element.

14. The light emitting package of claim 12, wherein the light emitting unit comprises any one selected from the group consisting of an LED (Light Emitting Diode), an OLED (Organic Light Emitting Diode), an LD (Laser Diode), a laser, and a VCSEL (Vertical Cavity Surface Emitting Laser).

15. The light emitting package of claim 13, further an optical selective member that transmits beams having some wavelengths and flowing into the light conversion substrate to a surface facing the light emitting unit, and for partially reflects conversion beams converted by the light conversion substrate.

16. The light emitting package of claim 15, wherein the optical selective member is disposed to be adjacent to one surface of the light conversion substrate, and has a structure in which at least two material layers having different refractive indexes are laminated.

17. The light emitting package of claim 16, wherein the optical selective member is configured such that a difference in refractive indexes between the material layers laminated to be adjacent to each other is 0.1 or more.

18. The light emitting package of claim 15, wherein the light conversion substrate is a ceramic substrate containing a phosphor.

19. The light emitting package of claim 16, wherein the ceramic substrate contains a metal oxide.

20. An automobile lamp, comprising:

a light emitting package of claim 10; and

a reflective module that reflects a conversion beam passing through a light conversion substrate for converting an excited beam emitted from a light emitting unit of the light emitting package into the conversion beam.