SHORT FOCUS LENS OPTICAL SYSTEM AND IMAGING DEVICE INCLUDING THE SAME

WIPO Patent Application WO/2017/078375

A1

According to one or more embodiments of the present disclosure, an optical system may include: a first lens having a positive refractive power and disposed along an optical axis and to face an object, the first lens further having a first convex face facing the object; a second lens having a positive refractive power and disposed along the optical axis adjacent to the first lens, the second lens further having a second convex face facing the object; a third lens having a negative refractive power and disposed along the optical axis adjacent to the second lens, the third lens further having a third concave face facing an image sensor; a fourth lens disposed along the optical axis adjacent to the third lens, the fourth lens being an aspherical lens; a fifth lens disposed along the optical axis adjacent to the fourth lens, the fifth lens being an aspherical lens and having a fourth face facing the object, the fourth face being convex where the fifth lens intersects the optical axis; and a sixth lens disposed along the optical axis adjacent to the fifth lens, the sixth lens is an aspherical lens. The fourth face of the fifth lens and a fifth face of the sixth lens facing the object has at least one inflection point, and characteristics of the optical system satisfy equation, 0.4