Patent ID: 6985288
Filing Date: 2006-01-10
Classification: G02B

Abstract:
1. A microscopic illumination apparatus be applied to a microscope selectively using plural types of objective lenses having different magnifications, which apparatus comprises: a light source; a collector lens for making a light flux emitted from said light source a substantially parallel light flux; and at least two fly-eye lenses disposed side by side along the optical axis at the back of said collector lens, with a space therebetween which is variable in accordance with an objective lens to be used in said microscope; wherein distance between the two fly-eye lenses is variable in accordance with magnification of the objective lens to be used; and wherein when magnification of the objective lens is lower, focal length of a fly-eye lens set including said fly-eye lenses is made shorter, and when magnification of the objective lens is higher, focal length of a fly-eye lens set including said fly-eye lenses is made longer, in each case by changing a distance between two of said fly-eye lenses.