Optical waveguide and luminaire incorporating same

• US 9,389,367 B2
• Filed: 07/10/2013
• Issued: 07/12/2016
• Est. Priority Date: 01/30/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Yuan, Zongjie, Wilcox, Kurt S., Tarsa, Eric J., Rol, Fabian Jean-Daniel, Ibbetson, James, Keller, Bernd P., Medendorp, Nicholas W. Jr.
• Primary Examiner(s): Sawhney, Hargobind S
• Application Number:
  US13/938,877
• Publication Number:
  US 20140211508A1
• Time in Patent Office: 1,098 Days
• Field of Search: 362/23.1, 362/23.2, 362/97.1, 362/97.2, 362/97.3, 362/230, 362/244, 362297-299, 362/309, 362/329, 362/333, 362/336, 362/337, 362/339, 362/555, 362/608, 362/610, 362/612, 362/613, 362/619, 362/620, 362/621, 362/625, 362/626, 349/57, 349/58, 349/62, 349/64, 349/65
• US Class Current: 1/1
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence

Abstract

An optical waveguide includes a body of optically transmissive material having a width substantially greater than an overall thickness thereof. The body of material has a first side, a second side opposite the first side, and a plurality of interior bores extending between the first and second sides each adapted to receive a light emitting diode. Extraction features are disposed on the second side and the extraction features direct light out of at least the first side and at least one extraction feature forms a taper disposed at an outer portion of the body.

Claims

1. An optical waveguide, comprising:

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

wherein the extraction features comprise a first extraction feature disposed at a first distance from the interior coupling cavity and a second extraction feature disposed at a second distance from the interior coupling cavity, wherein the first extraction feature comprises a first tapered extraction surface and the second extraction feature comprises a second tapered extraction surface, and wherein the first tapered extraction surface and the second tapered extraction surface are disposed at different angles with respect to the first side.

2. An optical waveguide, comprising:

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

wherein the extraction features comprise a first extraction feature disposed at a first distance from the interior coupling cavity and a second extraction feature disposed at a second distance from the interior coupling cavity, wherein the first extraction feature comprises a first tapered extraction surface and the second extraction feature comprises a second tapered extraction surface, and wherein the first tapered extraction surface and the second tapered extraction surface terminate at the second side and extend to first and second different distances, respectively, from the first side.

3. An optical waveguide, comprising:

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

wherein the extraction features comprise a first extraction feature disposed at a first distance from the interior coupling cavity and a second extraction feature disposed at a second distance from the interior coupling cavity, and wherein the first extraction feature comprises a first pitch and the second extraction feature comprises a second pitch different than the first pitch.

4. An optical waveguide, comprising:

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

wherein the extraction features comprise a first extraction feature disposed at a first distance from the interior coupling cavity and a second extraction feature disposed at a second distance from the interior coupling cavity, and wherein the first extraction feature comprises a first width and the second extraction feature comprises a second width different than the first width.

5. An optical waveguide, comprising:

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

wherein a V-shaped groove extends into the waveguide from the first side, at least one rib extends outwardly from the first side, and lenslets are disposed on the first side.

6. An optical waveguide, comprising

a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, a plurality of interior coupling cavities extending between the first and second sides each adapted to receive a light emitting diode, and extraction features on the second side;

wherein the extraction features are adapted to direct light out of at least the first side and wherein at least one extraction feature forms a taper disposed at an outer portion of the body.

7. The optical waveguide of claim 6, further comprising a reflective conical plug member extending into each interior coupling cavity for diverting light into and generally along the width of the body of material.

8. The optical waveguide of claim 7, wherein the reflective conical plug member is circular in a dimension transverse to the width and thickness of the body of material.

9. The optical waveguide of claim 8, in combination with LEDs disposed in the interior coupling cavities.

10. An optical waveguide assembly, comprising

a plurality of waveguides each comprising a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side and extraction features on the second side, and wherein at least one of the waveguides comprises an interior recess extending between the first and second sides and adapted to receive a light emitting diode;

wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity;

wherein the extraction features increase in depth with distance from the recess; and

wherein the extraction features are adapted to direct light out of at least one of the first and second sides and wherein at least one extraction feature is disposed at an outer portion of each body.

11. The optical waveguide assembly of claim 10, wherein the waveguides are integral with one another.

12. The optical waveguide of claim 10, wherein the at least one extraction feature comprises an inverted v-shape and extends fully about the interior recess.

13. The optical waveguide of claim 10, wherein the ring comprises a plurality of extraction features, each comprising a discrete prismatic shape.