ILLUMINATION DEVICE FOR MICROSCOPES

摘要

The invention provides a selectable bright field illumination device for microscopes which provides a simple automatic illumination system for two object lenses of different apertures in both switching positions without any change in the position and aperture of the diaphragms. To this end, in a prior art illumination device consisting of a light source (1), collector (2), radiant field stop (3), aperture diaphragm (4) and basic condenser (7) with a removable condenser head (8) or, alternatively to the condenser head (8), a condenser lens member (11) insertable between the aperture diaphragm (4) and the basic condenser (7), the aperture diaphragm (4) is arranged between the collector (2) and the radiant field stop (3) and imaged via an intermediate image in a plane (12) conjugated to the aperture diaphragm (4) by means of at least two auxiliary lenses (5; 6). The basic condenser (7) is supplemented in one switching position by the condenser head (8) and in the other by a condenser head (10) and the condenser lens member (11) in such a way that the two thus switchable condenser enlargements are in proportion to the switchable object lens enlargements.