LIGHT CONVERSION MEMBER AND LIGHTING DEVICE INCLUDING THE SAME

• US 20150159820A1
• Filed: 12/05/2014
• Published: 06/11/2015
• Est. Priority Date: 12/05/2013
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: LEE, Chang Hyuck
• Granted Patent: US 9,568,155 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 7/06 with parabolic curvature
• 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: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• 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: H01S 5/0087 for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials

Abstract

A light conversion member includes a surface of incidence which includes a recessed portion and on which a laser beam is incident and an output surface in which a wavelength of the laser beam is converted and the laser beam having the converted wavelength is output. The recessed portion has a shape corresponding to a wave front shape of the laser beam.

Claims

1. A light conversion member comprising:

a surface of incidence which includes a recessed portion and on which a laser beam is incident; and

an output surface in which a wavelength of the laser beam is converted and the laser beam having the converted wavelength is output,

wherein the recessed portion has a shape corresponding to a wave front shape of the laser beam.

2. The light conversion member of claim 1, wherein the shape of the recessed portion is formed differently according to a distance between a light source configured to radiate the laser beam and the light conversion member.

3. The light conversion member of claim 1, wherein the shape of the recessed portion has a Gaussian form.

4. The light conversion member of claim 1, wherein the shape of the recessed portion satisfies a radius of curvature function (R(α

_TEM)) of Equation 1 as follows;

5. The light conversion member of claim 1, wherein the recessed portion includes at least one concave portion or convex portion.

6. The light conversion member of claim 5, wherein a number of the concave portions or convex portions formed at the recessed portion is varied according to a transverse mode of the laser beam.

7. The light conversion member of claim 1, wherein the light conversion member includes at least one of a phosphor, a remote phosphor and a quantum dot.

8. The light conversion member of claim 1, wherein an anti-reflection layer is formed on the surface of incidence.

9. A light conversion member comprising:

a surface of incidence which includes a plurality of diffraction gratings and on which a laser beam is incident; and

an output surface in which a wavelength of the laser beam is converted and the laser beam having the converted wavelength is output,

wherein a distance between the diffraction gratings corresponds to a diameter of the laser beam.

10. The light conversion member of claim 9, wherein the plurality of diffraction gratings form a periodic pattern.

11. The light conversion member of claim 9, wherein the plurality of diffraction gratings form an aperiodic pattern.

12. A lighting device comprising:

a light source configured to radiate a laser beam;

a light conversion member in which a wavelength of the laser beam incident from the light source is converted and the laser beam having the converted wavelength is output; and

a reflection member configured to reflect light output from the light conversion member and to output the light as an output,

wherein a concavo-convex portion is formed on a surface of incidence of the light conversion member.

13. The lighting device of claim 12, wherein the concavo-convex portion includes a recessed portion, and a shape of the recessed portion has a shape corresponding to a wave front shape of the laser beam.

14. The lighting device of claim 13, wherein the shape of the recessed portion is formed differently according to a distance between the light source and the light conversion member.

15. The lighting device of claim 12, wherein the concavo-convex portion includes a plurality of diffraction gratings, and a distance between the diffraction gratings corresponds to a diameter of the laser beam.