Magnifying device

US9829616B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Zhisheng Yun · Woodbury, US
• Andrew John Ouderkirk · Kirkland, US
• Timothy L. Wong · Windom, US
• Erin A. McDowell · Afton, US
• Gregg A. Ambur · River Falls, US

Key dates

• Filing date: Sep 25, 2015
• Grant date: Nov 28, 2017
• Expiry date: Sep 25, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0138
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A magnifying device including an optical system is described. The optical system includes an exit pupil, a reflective polarizer proximate the exit pupil, a partial reflector disposed adjacent the reflective polarizer opposite the exit pupil, and a quarter wave retarder disposed between the reflective polarizer and the partial reflector. The reflective polarizer is curved about two orthogonal axes and the partial reflector is spaced apart from the reflective polarizer.