Patent ID: 9025259
Filing Date: 2015-05-05
Classification: G02B

Abstract:
1. A lens optical system comprising first, second, third, and fourth lenses that are arranged between an object and an image sensor where an image of the object is formed, in order from an object side, wherein the first lens has a positive (+) refractive power and a meniscus shape that is convex toward the object, the second lens has a positive (+) refractive power and a meniscus shape that is convex toward the image sensor, the third lens has a positive (+) refractive power and a meniscus shape that is convex toward the image sensor, and at least one of an incident surface and an exit surface of the fourth lens is an aspherical surface, wherein the lens optical system satisfies the following conditional expression, wherein θ is a viewing angle of the lens optical system.