Patent ID: 6128128
Filing Date: 2000-10-03
Classification: G02B

Abstract:
A microscope system for observing an image of a sample at desired magnifications comprising:a first objective lens having an object side surface which has telecentric optics;a focusing lens, disposed in an optical path along which optical rays emitted from the first objective lens travel, for focusing the optical rays and forming the image of the sample;a second objective lens having a magnification factor different from that of the first objective lens; andan interchanging member, holding the first objective lens and the second objective lens, for selecting one of the first objective lens and the second objective lens and placing the selected objective lens in an observational optical path between the sample and the focusing lens;wherein the following conditions are satisfied:0.29<D/fI<0.40, and0.35<.phi./D<0.50wherein D is a parfocal length which equals a distance between a surface of the sample and an attachment plane of the objective lens; fI is a focal length of the focusing lens; and .phi. is an outer diameter of a screw portion of an attachment portion of the selected objective lens, the attachment portion being fitted to the interchanging member.