Patent ID: 9658434
Date: 2017-05-23
CPC Classifications: G02B

Claim:
1. A lens optical system comprising: first through fifth lenses, which are sequentially arranged along a light proceeding path between an object and an image sensor where an image of the object is formed; and an aperture provided between the object and the image sensor, wherein the first lens has positive refractive power, the second lens has negative refractive power and a flat incident surface, the third lens has positive refractive power and is convex towards the image sensor, the fourth lens has negative refractive power and is a meniscus lens convex towards the image sensor, the fifth lens has negative refractive power, wherein at least one of an incident surface and an emitting surface of the fifth lens is aspheric, and the lens optical system satisfies Conditions 1 and 2 below: wherein FOV denotes a diagonal viewing angle of the lens optical system; and wherein AL denotes a distance from the aperture to the image sensor, and TTL denotes a distance along the optical axis from a center of an incident surface of the first lens to the image sensor.