CPC G02B 13/0045 (2013.01) [G02B 1/041 (2013.01); G02B 9/60 (2013.01); G02B 13/02 (2013.01); G02B 27/0025 (2013.01); G02B 27/646 (2013.01); G02B 5/005 (2013.01); G02B 9/00 (2013.01); G02B 13/002 (2013.01); H04N 2101/00 (2013.01); H04N 2201/00 (2013.01); Y10T 29/4913 (2015.01)] | 25 Claims |
1. A lens system, comprising:
a lens assembly that includes a plurality of refractive lens elements arranged along an optical axis and including, in order from an object side to an image side, a first group comprising a first lens element having a positive refractive power and a second lens element, and a second group comprising a first lens element and a second lens element;
a stop positioned before the first lens element of the first group; and
a window positioned between the plurality of refractive lens elements and an image plane,
wherein a smallest gap between lens elements is dMIN,
wherein a largest gap between lens elements dMAX is a gap between the first and second groups,
wherein dMAX is larger than 2.25 times any other gap between lens elements,
wherein at least one surface of at least one of the plurality of refractive lens elements is aspheric,
wherein the lens assembly has an effective focal length EFL and a total track length TTL, a ratio TTL/EFL smaller than 0.9, and a f number f# smaller than 2.9,
wherein a center thickness of each lens element is equal to or larger than 0.2 mm,
wherein a focal length f1 of the first lens element of the first lens group is smaller than TTL/2,
wherein a ratio L11/L1e between a largest optical axis thickness L11 and a circumferential edge thickness L1e of the first lens element of the first group is smaller than 3.5, and
wherein the lens system is embedded in a mobile device.
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