Patent ID: 9549108
Date: 2017-01-17
CPC Classifications: G02B

Claim:
1. A lens optical system comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged in a direction from an object to an image sensor on which an image of the object is formed, wherein the first lens has a positive (+) refractive power and an entrance surface convex toward the object, the second lens has a negative (−) refractive power and an exit surface concave toward the image sensor, the third lens has a positive (+) refractive power and a meniscus shape convex toward the image sensor, the fourth lens has a negative (−) refractive power and a meniscus shape convex toward the image sensor, the fifth lens has a negative (−) refractive power and at least one of an entrance surface and an exit surface of the fifth lens is an aspheric surface, and the entrance surface of the fifth lens has at least two inflection points between a center portion and an edge thereof, and the lens optical system satisfies the following formula: where θ denotes an angle of view of the lens optical system, and f denotes a focal length of the lens optical system.