Optical lens assembly with wide field of view

An optical lens assembly comprising an optical axis and a first optical lens comprising opposing first and second major surfaces and facing a second optical lens comprising opposing third and fourth major surfaces, the second and third major surfaces facing each other, wherein the first major surface comprises a convex central portion surrounded by an annular concave outer portion, the second major surface is convex, the third major surface is substantially planar, and the fourth major surface is convex, the first through fourth major surfaces having respective sags S1-S4 as a function of radial distance r from the optical axis, wherein S1*S2 has a first local peak at a first radial distance r1 and S1*S2/S4 has a second local peak at a second distance r2 different from r1;

• such that when a substantially collimated light beam with a beam diameter of between about 4 mm and 6 mm from an object comprising a spatial frequency of between about 15 to about 25 line pairs per millimeter propagates along a first direction, the first direction making a first angle of at least 15 degrees with the optical axis, intersects the optical axis at a first distance of greater than about 20 mm from the first major surface and is incident on the first major surface side of the optical lens assembly and focuses to a focal spot after going through at least each of the first and second optical lenses, a modulation transfer function (MTF) of the optical lens assembly for the incident light beam at the focal spot for a static, forward-gazing pupil is greater than about 0.7.

An optical lens assembly comprising an optical axis and at least first and second optical lenses comprising:

• a first major surface comprising a convex central portion surrounded by an annular concave outer portion, a convex second major surface, and a convex third major surface, the first through third major surfaces having respective sags S1, S2, and S4 as a function of radial distance r from the optical axis, wherein S1*S2/S4 has a local minimum;
• a partial reflector disposed on and substantially conforming to the third major surface;
• and
• a reflective polarizer disposed on and substantially conforming to the second major surface,
• wherein the optical lens assembly is configured to have a focus that is adjustable across a focus adjustment range extending at least from about −5 diopters to about 2 diopters by at least axially changing a separation between the first and second optical lenses, such that for each focus position in the focus adjustment range, the diopter curvature is less than about 1 diopter as a field of view angle changes from about zero degree to about 30 degrees.