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Advanced Condenser Systems

Abbe Condenser Design Number Five

In a modern microscope, the substage condenser functions to gather light from the tungsten-halide lamp and concentrates it into an inverted cone of light that illuminates the specimen with parallel beams of uniform intensity from all azimuths over the entire viewfield.

The Abbe condenser illustrated in Figure 1 constitutes the simplest and least corrected condenser design, which has two optical lens elements that produce an image of the illuminated field diaphragm showing signs of optical aberration. When viewed through the eyepieces, the image of the field diaphragm is not sharp and is surrounded by blue and red color at the edges. As a result of minimal optical correction, the Abbe condenser is suited mainly for routine observation with objectives of modest numerical aperture and magnification, such as found on the Intel Play QX3 Computer Microscope.

This condenser design is a prototype intended to replace the stock mixing chamber beneath the stage on the QX3 microscope. After removing the mixing chamber by loosening the two mounting screws, the condenser is attached by similar brackets to the same mounting flange. The stock QX3 tungsten lamp is replaced simultaneously with the mixing chamber.

Borrowing the condenser elements described in Abbe Condenser Design Number Two and Abbe Condenser Design Number Four, this design features a microscope base that houses an integral field lens and lamphouse. The tungsten lamp is cooled by an cylindrical aluminum heat sink that fits snugly into a ventilated housing, which is mounted onto another heat sink incorporated into the microscope base. A field lens is positioned with a mounting ring at the top of the heat sink.

An exterior view of the overall QX3 Abbe condenser design is illustrated in Figure 2 and an exploded view of the microscope base assembly is presented in Figure 3. The design can be executed in aluminum or polymer, with material candidates including acrylonitrile-butadiene-styrene (ABS), polystyrene, and polypropylene. Lens materials can be either polymethylmethacrylate (PMMA) or glass, and this choice will affect the major details of lens architecture and design.

The condenser aperture diaphragm can also be constructed of plastic or metal, depending upon lamp choice. As lamp power is increased, a corresponding increase in heat generated by the lamp will necessitate construction of surrounding materials of increasingly higher heat tolerance. The field lens should be constructed of glass to avoid distortion and optical artifacts that may be introduced by heat from the lamp filament. Reflector and heat sink construction materials should be aluminum. The tungsten or tungsten-halide lamp is powered by an external direct current (DC) power supply that draws current from a 120-volt source.

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