Field stop for dark field illumination in autofocus optical device
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United States of America Patent
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Jan 17, 1989
Grant Date -
N/A
app pub date -
Apr 17, 1987
filing date -
Apr 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical component is described which can be introduced into a finite or an infinite beam path and which is provided with a spectrally selective filtering characteristic and thus as the same time compensates the thereby generated geometric-optical negative influence by appropriate image-relevant compensation measures. The optical component exhibits at least one optically effective, non-planar surface. It has, for example, the property of completely absorbing visible light and of being completely transparent to shorter- or longer-wavelength light. In addition to this, a laser autofocus arrangement known per se is described, which is equipped with the optical component according to the invention, whereby a dark field illumination with an incident light microscope can be achieved while maintaining the autofocus function.
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