Patent ID: 9423593
Filing Date: 2016-08-23
CPC Classification: G02B

Claim Text:
1. An optical system comprising in order from an object side to an image side: a first lens having refractive power and having a meniscus shape of which an object-side surface is convex toward an object; a second lens having positive refractive power and having a meniscus shape in which it is convex toward the object; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power, wherein the optical system satisfies Conditional Expression 1: where T 23 is a distance (air gap) [mm] between the second and third lenses, and T 34 is a distance (air gap) [mm] between the third and fourth lenses, wherein there is a total of five lenses with refractive power.