Field stop for dark field illumination in autofocus optical devi

Details Field stop for dark field illumination in autofocus optical devi Field stop for dark field illumination in autofocus optical devi

1987-04-17

1989-01-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250226, 250237R, 356 4, G01J 120

Patent

active

047989483

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.

REFERENCES:
patent: 4512642 (1985-04-01), Ito et al.
patent: 4595829 (1986-06-01), Neumann et al.

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