Optical: systems and elements – Compound lens system – Microscope
Patent
1991-01-30
1992-09-01
Henry, Jon W.
Optical: systems and elements
Compound lens system
Microscope
359389, 359202, 359208, 359213, 359221, 250236, G02B 2100, G02B 2610
Patent
active
051444771
ABSTRACT:
A confocal scanning microscope operates to produce a small (preferably diffraction limited) spot on a sample, scan the spot over the sample in a raster pattern, and form an electrical signal corresponding to the intensity of light emanating from the region of the spot. The electrical signal is communicated to a computer which produces a visual display on a monitor. The optical train between the source (or detector) and the sample comprises first and second scanning elements, each operable to scan the beam in a different direction, an afocal assembly located between the two scanning elements so as to transfer the beam from the first scanning element to the second scanning element, and standard microscope components including an objective. The light emanating from the sample encounters the objective, the scanning elements, and the afocal assembly prior to reaching the detector. An aperture is disposed in front of the detector and blocks any light that emanated from points spatially displaced from the beam spot. The use of an afocal assembly in the optical train thus allows the elimination of pinhole spatial filters from the design.
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Henry Jon W.
Medical Research Council
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