Flexible light guide and lighting system

• US 10,684,406 B2
• Filed: 03/16/2018
• Issued: 06/16/2020
• Est. Priority Date: 03/16/2018
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Original Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Inventors: Mauzy, Jameson R., Upton, Brendan, Trapani, Christian D.
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US15/924,063
• Publication Number:
  US 20190285792A1
• Time in Patent Office: 823 Days
• CPC Class Codes: B29C 39/42 Casting under special conditions, e.g. vacuum
• CPC Class Codes: B29C 45/1704 the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles B29C45/1732 and B29C45/1734 take precedence; injection blow-moulding B29C49/06
• CPC Class Codes: B29D 11/00663 Production of light guides
• CPC Class Codes: B29L 2011/0075 Light guides, optical cables
• CPC Class Codes: B64D 11/00 Passenger or crew accommodation; Flight-deck installations not otherwise provided for
• CPC Class Codes: B64D 2011/0038 Illumination systems for cabins as a whole
• CPC Class Codes: B64D 2203/00 Aircraft or airfield lights using LEDs
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package

Abstract

In accordance with embodiments of this disclosure a light guide includes a flexible substrate having two outer surfaces with at least one of the two outer surfaces defining a light emitting area. At least one edge of the flexible substrate is configured to receive light from a light source coupled to the edge. The light guide further includes a plurality of light extraction features formed within the flexible substrate in between the two outer surfaces. The light extraction features may be arranged according to a controlled distribution that affects a propagation of light in between the two outer surfaces and an emission of light from the light emitting area.

Claims

1. A lighting system, comprising:

a light source;

a light fixture, the light fixture including at least one longitudinal support member with first projections and second projections, the first projections configured to couple the longitudinal support member with a curved support surface; and

a light guide coupled to the light source and the light fixture, the light guide configured to extend along the curved support surface, the light guide including;

a flexible substrate having two outer surfaces, the two outer surfaces including a first outer surface that defines a light emitting area and a second outer surface that is coupled to the second projections of the light fixture, the second projections at least partially extending through the second outer surface to couple the flexible substrate to the curved support surface;

at least one edge of the flexible substrate configured to receive light from the light source; and

a plurality of light extraction features formed within the flexible substrate in between the two outer surfaces, the plurality of light extraction features having a controlled distribution that affects a propagation of light in between the two outer surfaces and an emission of light from the light emitting area.

2. The lighting system of claim 1, wherein the flexible substrate is a flexible silicon substrate.

3. The lighting system of claim 1, wherein the plurality of light extraction features include a plurality of bubbles formed within the flexible substrate.

4. The lighting system of claim 1, wherein the controlled distribution of the plurality of light extraction features is a non-uniform distribution of light extraction features.

5. The lighting system of claim 4, wherein a first region of the flexible substrate has less light extraction features than a second region of the flexible substrate, and the first region is closer to the at least one edge than the second region.

6. The lighting system of claim 4, wherein a first region of the flexible substrate has smaller light extraction features than a second region of the flexible substrate, and the first region is closer to the at least one edge than the second region.

7. The lighting system of claim 1, wherein the at least one edge of the flexible substrate has a first thickness, and an inner portion of the flexible substrate has a second thickness that is less than the first thickness.

8. The lighting system of claim 7, wherein a portion of the flexible substrate in proximity to the at least one edge is tapered from the first thickness to the second thickness.

9. The lighting system of claim 1, wherein the flexible substrate includes at least one light steering feature configured to redirect a portion of the light propagating in between the two outer surfaces when the light at least partially reflects off of the at least one light steering feature.

10. The lighting system of claim 9, wherein the at least one light steering feature comprises a reflector disposed upon at least a portion of an outer edge of the flexible substrate.

11. The lighting system of claim 9, wherein the at least one light steering feature comprises a reflective element embedded within the flexible substrate so that at least a portion of the reflective element is in between the two outer surfaces of the flexible substrate.

12. The lighting system of claim 9, wherein the at least one light steering feature comprises a reflector disposed upon at least a portion of an inner edge of a cutout portion of the flexible substrate.