Optical system and magnifying device

US10338393B2 · 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: Oct 18, 2017
• Grant date: Jul 2, 2019
• Expiry date: Oct 18, 2037

Classification

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

Abstract

An optical system and a magnifying device including the optical system are 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.