Ernst Leitz Wetzlar Gmbh

Wild Leitz Gmbh

Burkhard Neumann

Hans-Werner Stankewitz

Gunter Reinheimer

Spectral microscope with a photometer

An apparatus for producing an optical image contrast which may be used in a microscope is disclosed. Specifically, the apparatus is based on the Moire effect and uses two screens or gratings which are rotated simultaneously at different angular velocities in order to increase the depth of focus and resolution achievable with conventional systems.

Apparatus for producing an optical image contrast

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.

Field stop for dark field illumination in autofocus optical device

An automatic focusing apparatus for optical instruments, in particular for reflected light microscopes, wherein a measuring point is produced on the surface of an object by an eccentric measuring beam formed by blocking a portion of the path of a full beam. The measuring point is imaged onto a photoelectric device by reflecting the measuring beam along the blocked out path. When the object plane wanders from the focal plane, the photoelectric device actuates a control device which returns the object plane to the focal plane. The apparatus comprises a source of light to produce a, preferably pulsed, laser light for the full measuring beam, an optical structural element for geometrically blocking one-half of the full measuring beam to produce the eccentric measuring beam and simultaneously for geometrically blocking the reflected measuring beam from the path of the full measuring beam. A lens is positioned in the measuring beam and a photodetector device in the form of a differential photodiode pair is positioned to receive the reflected measuring beam. A divider mirror, preferably dichromatic, is provided for introducing the measuring beam into the path of the illuminating beam of the optical device and for reflecting the reflected measuring beam from the path of the illuminating beam of the optical instrument.

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Wetzlar, Germany

Burkhard Neumann