Microscope

Overview

The compound microscope magnifies small specimens up to about 1000× by passing light through the sample and a series of lenses. This trinocular laboratory model adds a third optical path to the binocular eyepieces, feeding a digital camera so the live image can be captured or displayed. It is a workhorse for histology, microbiology, and materials inspection. Köhler illumination, the defining feature of a research-grade stand, produces an evenly lit field free of any image of the lamp filament.

Construction

Everything mounts on the Stand & Frame, a heavy die-cast base and rigid C-shaped arm that gives the instrument a low center of gravity and holds the optical groups in fixed alignment. The specimen sits on the Mechanical Stage, a mechanical XY platform whose coaxial knobs translate the slide precisely under the objective through a rack and pinion. The Focus Mechanism mechanism raises and lowers the stage on a dovetail slide with stacked coarse and fine knobs, the fine knob geared down for micron-level adjustment.

How it works

The Illumination System system sets up the Köhler path: an LED lamp feeds a collector lens and field diaphragm, and the Condenser Assembly cones that light onto the slide with an adjustable aperture that controls contrast, resolution, and depth of field. Light passing through the specimen enters whichever objective is clicked into place on the Revolving Nosepiece, a detented turret carrying parfocal objectives from 4× to 100×, each correcting aberrations for a sharp magnified image.

The magnified beam travels up to the Trinocular Head, where a prism set splits it between the two eyepieces and the third camera tube. Through the Camera Port port, a C-mount adapter projects that third path onto a digital image sensor, and the optional Digital Display shows the live view on an LCD. A switch-mode power supply drives the lamp, camera, and display from mains.