Patent ID: 11099361

Abstract:
A small lens system having five lenses arranged along an optical axis from a focal object side in order of a first, a second, a third, a fourth, and a fifth lens is proposed. A center interval (T12c) of the first and the second lens is T12c<0.2 mm, and an effective outermost interval (T12e) satisfies T12e<0.2 mm. The fifth lens has a positive refractive power, a front surface convex toward the focal object, a rear curvature (C10) satisfying −0.01<C10<0.01, and the periphery of a rear surface convex upwards. A center interval (T45c) of the fourth and the fifth lens is T45c<0.1 mm and an effective outermost distance (T45e) thereof satisfies T45e>0.35 mm. Thicknesses of each lens from the first to the fifth lens and a distance (TL) from the front to the rear surface of the lens system satisfy (ct1+ct2+ct3+ct4+ct5)/TL<0.47.