Patent ID: 7206128

Claim:
An illumination unit of a stereomicroscope comprising: an objective; a pair of observation optical axes aligned with an inward angle to each other which pass through the objective and cross on a surface of a sample; a pair of illumination light sources which outputs illumination light; a pair of illumination optical axes which is aligned with the same inward angle as the observation optical axes to each other, and on which the illumination light outputted from the illumination light sources travels; a pair of illumination lenses which condenses the illumination light traveled on the illumination optical axes; a mirror which is provided on the illumination optical axes, and reflects the illumination light condensed by the illumination lenses on one plane; and a half mirror which is provided on the observation optical axes, and reflects the illumination light reflected by the mirror coaxially reflected to the observation optical axes, and transmits the light from the sample to the objective.