Apparatus and method for receiving light from a point-like source and emitting light over an extended surface area

• US 8,147,099 B2
• Filed: 06/27/2008
• Issued: 04/03/2012
• Est. Priority Date: 06/29/2007
• Status: Expired due to Fees

• Current Assignee: Dialight Lumidrives Limited
• Original Assignee: Dialight Lumidrives Limited
• Inventors: Thornton, Shane
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US12/163,765
• Publication Number:
  US 20090080198A1
• Time in Patent Office: 1,376 Days
• Field of Search: 362/297, 362/299, 362/303, 362/327, 362/355, 362/560, 362/629, 362632-634
• US Class Current: 362/299
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 2200/30 of light guides doped with fluorescent agents
• CPC Class Codes: F21V 27/02 Cable inlets
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A method and apparatus are disclosed for receiving light from one or more light sources, each of which comprises a substantially point-like light source. The received light is them emitted over an extended surface area including a first surface of an optical controller arranged to refract light received from at least one light source, a second surface of the optical controller arranged to reflect the light received from the first surface of the optical controller, the first surface and the second surface being arranged with respect to each other to enable total internal reflection of the light reflected from the at least one light surface, and a plurality of reflection elements located within the optical controller arranged to alter the path of the light traversing the optical controller so as to direct light out of the optical controller.

Claims

1. An apparatus for receiving light from one or more light sources, each comprising a substantially point-like light source, and emitting the light over an extended surface area, comprising:

a first surface of an optical controller arranged to refract light received from at least one light source;

a second surface of the optical controller arranged to reflect the light received from the first surface of the optical controller, said first surface and said second surface arranged with respect to each other to enable total internal reflection of the light received from said at least one light source; and

a plurality of reflection elements distributed within the volume of the optical controller arranged to alter the path of the light traversing the optical controller so as to direct light out of the optical controller;

wherein said first surface further comprises a plurality of refraction elements arranged to refract light, received from the at least one light source, at an angle with respect to said second surface so as to enable total internal reflection;

wherein said plurality of refraction elements further comprises a plurality of first refraction elements arranged to receive light travelling normal to the first surface of the optical controller and refract the light as it passes into the optical controller, and a plurality of second refraction elements arranged to receive light that is not emitted in a direction normal to the first surface of the optical controller and refract the light as it passes into the optical controller;

wherein said second surface of the optical controller further comprises at least one conical depression feature arranged to reflect light refracted by the plurality of first refraction elements back into the optical controller.

2. The apparatus as claimed in claim 1 wherein the plurality of refraction elements are arranged in a circular symmetric pattern on said first surface.

3. The apparatus as claimed in claim 2 further comprising at least one light source arranged to emit light towards the optical controller.

4. The apparatus as claimed in claim 3, wherein said at least one light source is arranged so as to be substantially centrally aligned with respect to the circular symmetric pattern of the plurality of refraction elements.

5. The apparatus as claimed in claim 1 wherein the plurality of reflection elements are homogenously distributed throughout the optical controller.

6. The apparatus as claimed in claim 1 further comprising an outer casting on which the optical controller is mounted.

7. The apparatus as claimed in claim 6 further comprising at least one light source arranged to emit light towards the optical controller.

8. The apparatus as claimed in claim 7 wherein the at least one light source is secured to the outer casting in a position with respect to the optical controller.

9. The apparatus as claimed in claim 6 wherein the optical controller further comprises a plurality of tabs arranged so as to secure the optical controller with respect to the outer casting.

10. The apparatus as claimed in claim 9 further comprising at least one light source arranged to emit light towards the optical controller.

11. The apparatus as claimed in claim 10 wherein the at least one light source is secured to the outer casting in a position with respect to the optical controller.

12. The apparatus as claimed in claim 1 further comprising at least one light source arranged to emit light towards the optical controller.

13. The apparatus as claimed in claim 1, wherein the optical controller comprises a moulded transparent material.

14. A method for manufacturing an apparatus for receiving light from one or more light sources and emitting the light over a larger surface area, comprising the steps of:

providing an optical controller comprising;

a first surface of the optical controller arranged so as to refract light received from at least one light source;

a second surface of the optical controller arranged to reflect the light received from the first surface, said first surface and said second surface arranged with respect to each other to enable total internal reflection of the light received from said at least one light source; and

a plurality of reflection elements distributed within the volume of the optical controller arranged to alter the path of the light traversing the optical controller so as to urge it to exit the optical controller;

providing at least one light source to emit light towards the optical controller; and

providing an outer casting onto which the at least one light source and the optical controller are secured with respect to each other;

wherein providing said optical controller further comprises the step of providing a plurality of refraction elements on said first surface of the optical controller arranged to refract light, received from the at least one light source, at an angle with respect to said second surface so as to enable total internal reflection within said optical controller;

wherein providing said plurality of refraction elements further comprises the steps of providing a plurality of first refraction elements arranged to receive light travelling normal to the first surface of the optical controller and refract the light as it passes into the optical controller, and providing a plurality of second refraction elements arranged to receive light that is not emitted in a direction normal to the first surface of the optical controller and refract the light as it passes into the optical controller; and

providing at least one conical depression feature on the second surface of the optical controller to reflect light refracted by the plurality of first refraction elements back into the optical controller.

15. The method as claimed in claim 14 further comprising the step of:

arranging said plurality of refraction elements in a circular symmetric pattern on said first surface.

16. The method as claimed in claim 15 further comprising the step of:

securing said at least one light source to said outer casting so that the at least one light source is arranged so as to be substantially centrally aligned with respect to the circular symmetric pattern of the plurality of refraction elements.

17. The method as claimed in claim 14 wherein the step of providing a plurality of reflection elements further comprises the step of:

homogenously distributing the plurality of reflection elements throughout the optical controller.

18. The method as claimed in claim 14 further comprising the step of providing the optical controller with at least one tab to secure the optical controller to the outer casting.

19. The method as claimed in claim 14 further comprising the step of:

moulding said optical controller out of a transparent material.

20. A method for receiving light from one or more light sources and emitting the light over a larger surface area, comprising:

receiving light from at least one light source at a first surface of an optical controller and refracting the light as it passes into the optical controller;

receiving the light at a second surface of the optical controller and reflecting the light received from the first surface of the optical controller, said first surface and said second surface arranged with respect to each other to enable total internal reflection of the light received from said at least one light source; and

altering the path of the light traversing the optical controller so as to urge the light to exit the optical controller, said altering provided by a plurality of reflection elements located within the optical controller;

wherein receiving the light from said at least one light source at said first surface of said optical controller further comprises the step of receiving the light at a plurality of refraction elements on said first surface, and refracting the light, received from the at least one light source, at an angle with respect to said second surface so as to enable total internal reflection within said optical controller;

wherein receiving the light at a plurality of refraction elements further comprises the steps of receiving light travelling normal to the first surface at a plurality of first refraction elements, and refracting the light traveling normal to said first surface as it passes into said optical controller, and receiving light that is not emitted in a direction normal to said first surface at a plurality of second refraction elements, and refracting the light that is not emitted in a direction normal to said first surface as it passes into said optical controller; and

reflecting, by at least one conical depression feature on said second surface, light refracted by said plurality of first refraction elements back into the optical controller.