公开(公告)号：US10718890B2

公开(公告)日：2020-07-21

申请号：US16080755

申请日：2017-02-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Brian W. Ostlie ,  Tao Liu ,  Del R. Lawson ,  Brent A. Hedding ,  James A. Phipps ,  Jeffrey J. Pederson

IPC: G02B6/02 ,  F21V8/00 ,  B60Q1/26 ,  B60Q3/64 ,  B60Q3/217

Abstract: A lightguide includes features for extracting light that would otherwise be confined and propagate within the lightguide primarily by total internal reflection. A first portion of light propagating within the lightguide and extracted exits the lightguide through a first area of the lightguide having an optical reflectance of at least 30% and an optical transmittance of at least 5% for normally incident light at a wavelength of the extracted light. A second portion of light propagating within the lightguide and extracted exits the lightguide through a different second area of the lightguide having an optical transmittance of at least 80% for normally incident light at the wavelength of the extracted light.

公开(公告)号：US20190072703A1

公开(公告)日：2019-03-07

申请号：US16080755

申请日：2017-02-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Brian W. Ostlie ,  Tao Liu ,  Del R. Lawson ,  Brent A. Hedding ,  James A. Phipps ,  Jeffrey J. Pederson

IPC: F21V8/00 ,  B60Q1/26 ,  B60Q3/217 ,  B60Q3/64

CPC classification number: G02B6/001 ,  B60Q1/2611 ,  B60Q1/2661 ,  B60Q1/2669 ,  B60Q3/217 ,  B60Q3/64

Abstract: A lightguide includes features for extracting light that would otherwise be confined and propagate within the lightguide primarily by total internal reflection. A first portion of light propagating within the lightguide and extracted exits the lightguide through a first area of the lightguide having an optical reflectance of at least 30% and an optical transmittance of at least 5% for normally incident light at a wavelength of the extracted light. A second portion of light propagating within the lightguide and extracted exits the lightguide through a different second area of the lightguide having an optical transmittance of at least 80% for normally incident light at the wavelength of the extracted light.