| CPC G02B 9/04 (2013.01) [H04N 23/55 (2023.01)] | 18 Claims |
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1. An optical lens assembly comprising an optical axis and configured to be viewed by a viewer from a viewer-side of the optical lens assembly, to have a display disposed on an opposite display-side of the optical lens assembly, and to display a virtual image of an image emitted by the display to the viewer after the emitted image passes through the optical lens assembly three times, the optical lens assembly comprising:
at least two optical lenses having at least one curved major surface;
a partial reflector disposed on and conforming to a first major surface of the lens assembly and having an average optical reflectance of at least 30% for at least each of first and second visible wavelengths in a visible wavelength range extending from about 420 nm to about 680 nm, the first and second visible wavelengths different by at least 100 nm; and
a reflective polarizer disposed on and conforming to a second, different than the first, major surface of the lens assembly, such that for a substantially normally incident light and for each of the first and second visible wavelengths, the reflective polarizer has an optical reflectance of greater than about 60% for the incident light polarized along a first direction and an optical transmittance of greater than about 60% for the incident light polarized along a second direction, orthogonal to the first direction;
such that for a substantially unpolarized collimated light incident on the lens assembly from the viewer-side, the lens assembly focuses the incident light on the display-side of the optical system and forms a first focused incident light at an average spacing T1 from the optical axis after the incident light passes through the lens assembly for a first time and a second focused incident light at an average spacing T2 from the optical axis after the incident light passes through the lens assembly for second and third times, wherein T1 is measured within a plane substantially orthogonal to the optical axis and containing focal points of the first focused incident light and T2 is measured within a plane substantially orthogonal to the optical axis and containing focal points of the second focused incident light, such that due to the difference between the first and second visible wavelengths, the first and second focused incident lights have respective lateral chromatic aberrations D1 and D2, D2/T2<D1/T1 by at least a factor of about 2 across at least a 40-degree field of view.
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