Optical film and polarizing beam splitter

US12386191B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• David J. W. Aastuen · Farmington, US
• Zhisheng Yun · Woodbury, US
• Timothy J. Nevitt · Red Wing, US
• John D. Le · Woodbury, US
• Susan L. Kent · Shorewood, US
• Gilles J. Benoit · Minneapolis, US
• David T. Yust · Woodbury, US

Key dates

• Filing date: Dec 4, 2019
• Grant date: Aug 12, 2025
• Expiry date: Jun 23, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/3083
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical film and a polarizing beam splitter (PBS) including the optical film is described. The optical film includes a first optical stack disposed on, and spaced apart by one or more spacer layers from, a second optical stack. When the optical film is disposed between, and adhered to, hypotenuses of first and second prisms to form a PBS and a cone of light is incident on the PBS making an incident angle of about 40 to 50 degrees with the optical film, the PBS has: an average optical reflectance Rs greater than about 95% for a first polarization state; an average optical transmittance Ts less than about 0.012% for the first polarization state; an average optical transmittance Tp less than about 98.5% for a second polarization state; and an average optical reflectance Rp less than about 0.25% for the second polarization state.