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Assignee3M Innovative Properties Company
InventorsZhisheng Yun, Andrew J. Ouderkirk, Susan L. Kent, Erin A. McDowell, Timothy L. Wong, John D. Le, Michael L. Steiner
Estimating the term…
A bi-focal prescription eyewear lens includes a substrate and a reflective polarizer, or a partial reflector, bonded to the substrate. A reflective polarizer substantially transmits light having a first polarization state and substantially reflects light having an orthogonal second polarization state. The bi-focal optical lens has a first focal length for light having the first polarization state and a second focal length for light having the second polarization state. The first focal length is longer than the second focal length. Without the reflective polarizer or partial reflector, the bi-focal optical lens would have a single focal length. Eyeglasses can include the bi-focal prescription eyewear lens.
An optical lens comprising a partial reflector disposed between first and second polarizers, such that for a wavelength range of 400 nm to 700 nm, the first polarizer substantially transmits light having a first polarization state and substantially blocks light having an orthogonal second polarization state, the second polarizer substantially transmits light having a third polarization state and substantially reflects light having an orthogonal fourth polarization state, and the partial reflector has an average optical reflectance and an average optical transmittance that are each in a range of 40% to 60%.
Dependencies are inferred from the claim text.