Lightguide

US10775547B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Robert M. Emmons · Saint Paul, US
• David A. Rosen · North St. Paul, US
• Nicholas A. Johnson · Burnsville, US
• Gary T. Boyd · Woodbury, US
• Trevor W. Stolber · Stillwater, US
• Owen M. Anderson · Minneapolis, US
• Graham M. Clarke · Woodbury, US
• Sherie A. Kristie · Hudson, US
• Edward C. Roberts · Maplewood, US
• Kristy A. Gillette · Spring Valley, US

Key dates

• Filing date: Mar 12, 2018
• Grant date: Sep 15, 2020
• Expiry date: Mar 12, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0065
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A lightguide having opposing first and second major surfaces where the first major surface includes a plurality of extended features and a plurality of discrete features is described. The lightguide has a viewable area having a length at least 100 times a thickness of the lightguide. The extended features extend in a first in-plane direction across at least 90 percent of the length L of the viewable area. The discrete features are spaced apart along the length and width of the viewable area. The discrete features may be disposed in spaces between the extended features. The discrete features may have faces extending between and connecting adjacent extended features.