Tokyo Visionary Optics Co., Ltd.

Ruidong Yang

Yukio Sekine

Koki Tokuno

There is provided an imaging lens having a low profile and a low F-number and allowing satisfactory correction of aberrations. An imaging lens comprises in order from an object side, a first lens Lwith positive refractive power, a second lens Lwith negative refractive power, a third lens L, a fourth lens Lwith positive refractive power, and a fifth lens Lwith negative refractive power, wherein an image-side surface of said fourth lens Lis convex in a paraxial region, an object-side surface of said fifth lens Lis an aspheric surface having at least one inflection point, and the following conditional expressions are satisfied:/Dep<2.0  (1)1.2<3/2<1.8  (2)15<3<35  (3)−1.0<55<−0.3  (4)

Imaging lens

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, said second lens has an image-side surface being convex in a paraxial region, said third lens has an object-side surface being concave in a paraxial region, said fourth lens has an object-side surface being concave in a paraxial region, said sixth lens has an object-side surface being convex in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region.

Growing community of inventors

Tokyo, Japan

Ruidong Yang