Optical assembly with protective coating

US11709299B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Gregg A. Ambur · River Falls, US
• Benjamin G. Sonnek · Mahtomedi, US
• Jo A. Etter · Stillwater, US
• Timothy L. Wong · Windom, US
• Thomas P. Klun · Lakeland, US
• Richard J. Pokorny · Maplewood, US
• Benjamin R. Coonce · South St. Paul, US
• Douglas S. Dunn · Maplewood, US
• Henry A. Kostalik, IV · Minneapolis, US
• Christopher S. DeGraw · Inver Grove Heights, US
• John R. Jacobson · Newport, US
• Chunjie Zhang · Louisville, US
• Jung-Sheng Wu · Woodbury, US

Key dates

• Filing date: Jun 7, 2019
• Grant date: Jul 25, 2023
• Expiry date: Apr 2, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/3025
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical assembly including an optical element insert molded directly onto an optical stack is provided. The optical stack includes an optical film and may include a liner with the optical film being disposed between the optical element and the liner. The liner, if included, is removable from the optical film without substantial damage to the optical film. An outermost layer of the optical film may be diffusion bonded to a major surface of the optical element. The optical film includes a protective coating having an average thickness of no more than 30 micrometers. The protective coating includes an at least partially cured composition. The composition includes 70 to 96 weight percent of urethane (meth)acrylate compound having an average (meth)acrylate functionality of 2 to 9.5, and 2 to 20 weight percent of (meth)acrylate monomer having a (meth)acrylate functionality of 1 to 2.