Imaging lens

摘要

An imaging lens substantially consists of six lenses of a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens and a positive sixth lens in this order from an object side. When a curvature radius of an object-side surface of the fourth lens is R8, and a curvature radius of an image-side surface of the fourth lens is R9, and an Abbe number of the material of the third lens for d-line is νd3, and an Abbe number of the material of the fifth lens for d-line is νd5, the following conditional formulas (1) and (6) are satisfied:
−0.61<(R8+R9)/(R8−R9)<0.44  (1); and38.1<νd3+νd5<45.1  (6).

主权项

1. An imaging lens consisting of six lenses of a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens and a positive sixth lens in this order from an object side,
wherein Abbe numbers of materials of the first lens, the second lens, the fourth lens and the sixth lens for d-line are greater than or equal to 40, wherein Abbe number of material of the fifth lens is less than or equal to 30; and wherein the following conditional formulas are satisfied:
−0.075<(R8+R9)/(R8−R9)<0.11  (1-2)−1 R8: a curvature radius of an object-side surface of fourth lens, R9: a curvature radius of an image-side surface of fourth lens, f: a focal length of an entire system, R5: a curvature radius of an object-side surface of the third lens, and R3: a curvature radius of an object-side surface of the second lens.