IPC分类号：
F21K9/00 | F21K9/60 | F21V13/00 | F21V13/02 | F21V13/04
国民经济行业分类号：
C3545 | C3871 | C3976
当前申请(专利权)人：
BRIGHT VIEW TECHNOLOGIES CORPORATION
原始申请(专利权)人：
BRIGHT VIEW TECHNOLOGIES CORPORATION
当前申请(专利权)人地址：
1100 Boulders Parkway,Richmond, Virginia 23225 US
发明人：
SHEN, BING | PURCHASE, KEN G. | RINEHART, THOMAS A. | WILSON, JOHN W.
代理人：
KARCESKI, JEFFREY D.
摘要：
A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution. The light transmissive substrate includes a first surface comprising a plurality of microstructures, and a second surface on a side of the substrate opposite the first surface. The substrate is configured to receive light in a Lambertian distribution from a light source at the first surface and transform the light into a batwing distribution exiting the second surface. The batwing distribution having a peak intensity at about ±30° to about ±60° from X and Y axes, and a minimum intensity at nadir.
技术问题语段：
The technical problem addressed in this patent is the need for a more compact and efficient way to transform the light emitted by an LED light source into a batwing distribution for uniform illumination of a large area. Current optical lenses used for this purpose are bulky and not suitable for all applications. The invention proposes a solution using micro optical transmissive structures that are fabricated on a light transmissible substrate. These structures include a first surface with a plurality of microstructures and a second surface opposite the first surface. The microstructures have a shape that is designed to transform a Lambertian distribution into a batwing distribution with a peak intensity at about ±30° to about ±60° and a minimum intensity at nadir. The invention provides a solution for applications where a compact and efficient solution is needed for achieving uniform illumination.
技术功效语段：
The patent describes a way to transform the light emitted from an LED light source into a more uniform distribution for large area illumination. This is achieved by using micro optical structures on a light transmissible substrate that can be made more compact than current optical lenses. The transformation is done by creating microstructures on the substrate that have a specific shape, such as a pyramid or a frustum of a pyramid, which causes the light to exit the substrate with a specific angle distribution. This results in a batwing distribution, which is more desirable for achieving uniform illumination. The invention provides a way to achieve a uniform illumination over a large area relative to the size of the LED light source.
权利要求：
WHAT IS CLAIMED IS:
1. A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution, the light transmissive substrate comprising:
a first surface comprising a plurality of microstructures; and
a second surface on a side of the substrate opposite the first surface,
wherein the substrate is configured to receive light in a Lambertian distribution from a light source at the first surface and transform the light into a batwing distribution exiting the second surface, the batwing distribution having a peak intensity at about ±30° to about ±60° from X and Y axes, and a minimum intensity at nadir.
2. The light transmissive substrate according to claim 1 , wherein each of the plurality of microstructures has a shape of a pyramid extending in a direction away from the second surface.
3. The light transmissive substrate according to claim 2, wherein at least the microstructures are made from material having a refractive index of about 1.5, and the pyramid has a roof angle of between about 70° and about 95°.
4. The light transmissive substrate according to claim 2, wherein each pyramid has a base portion and a top portion connected to the base portion, the top portion comprising a tip of the pyramid and having sides disposed at different angles than sides of the base portion.
5. The light transmissive substrate according to claim 4, wherein at least the microstructures are the made from material having a refractive index of about 1.5, the sides of the base portion are disposed at angles of about 55° relative to a plane substantially parallel to the second surface, and the top portion has a roof angle of between about 85° and about 90°.
6. The light transmissive substrate according to claim 1 , wherein each of the plurality of microstructures has a shape of a frustum of a pyramid and a recess in a shape of a reverse pyramid.
7. The light transmissive substrate according to claim 6, wherein at least the microstructures are made from material having a refractive index of about 1.5, sides of the frustum are disposed at angles of about 55° relative to a plane substantially parallel
to the second surface, and the reverse pyramid has a roof angle of between about 85° and about 90°.
8. The light transmissive substrate according to claim 1 , wherein each of the plurality of microstructures has a shape of a corner cube.
9. The light transmissive substrate according to claim 1 , wherein the second surface is substantially planar.
10. The light transmissive substrate according to claim 1 , wherein the second surface comprises a texture.