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US 2020/0271902 A1Published application
Miniature telephoto lens assembly
AssigneeCorephotonics Ltd.
InventorsMichael Dror, Ephraim Goldenberg, Gal Shabtay
Life of this patent
Estimating the term…
Abstract
An optical lens assembly includes five lens elements and provides a TTL/EFL<1.0. In an embodiment, the focal length of the first lens element f1<TTL/2, an air gap between first and second lens elements is smaller than half the second lens element thickness, an air gap between the third and fourth lens elements is greater than TTL/5 and an air gap between the fourth and fifth lens elements is smaller than about 1.5 times the fifth lens element thickness. All lens elements may be aspheric.
Claims18
A lens system, comprising:
- a) a lens assembly comprising a plurality of refractive lens elements arranged along an optical axis with a first lens element on an object side, wherein at least one surface of at least one of the plurality of lens elements is aspheric, and wherein the lens assembly has an effective focal length EFL;
- and
- b) a window positioned between the plurality of lens elements and an image plane,
- wherein the lens system has a total track length TTL of 6.5 mm or less, a ratio TTL/EFL smaller than 1.0, a F number smaller than 3.2, and a ratio L11/L1e between a largest optical axis thickness L11 and a circumferential edge thickness L1e of the first lens element smaller than 4.
1 more element
Dependencies are inferred from the claim text.