Patent ID: 7800841

Claim:
An optical object distance simulation device for reducing total optical path, comprising: a lens that is a concave-convex lens; an achromatic lens set disposed beside one side of the lens, wherein the achromatic lens set is composed of a first lens and a second lens, the first lens is a double-concave lens, the second lens is a double-convex lens, the edge of one concave face of the concave-convex lens contacts with the edge of one concave face of the double-concave lens to form a gap between the concave-convex lens and the double-concave lens, and the other concave face of the double-concave tightly contacts with one convex face of the double-convex lens; a first image lens disposed beside one side of the achromatic lens set; and a second image lens disposed beside one side of the first image lens; whereby, the lens, the achromatic lens set, the first image lens, and the second image lens are matched with each other in order to simulate real object distance for reducing an object distance between a test camera lens and a corresponding chart.