Automatic focusing device for reflected light microscopes

Details Automatic focusing device for reflected light microscopes Automatic focusing device for reflected light microscopes

1986-07-30

1988-04-12

Punter, William H.

350518, 350526, G02B 2106

Patent

active

047370220

ABSTRACT:
An automatic focusing microscope switchable between light-field and dark-field positions, so designed that the automatic focusing is operative in the dark-field condition or mode as well as in the light-field condition. In a first embodiment, auxiliary illumination of special wavelength (infrared or ultraviolet) used for the automatic focusing is reflected into the illumination-light ray path or beam, and in the dark-field mode the central portion of this beam is intercepted by a filter member which is opaque in the visible spectral region but transmits in the spectral region of the auxiliary illumination used for the automatic focusing function.

REFERENCES:
patent: 2103230 (1937-12-01), Benford et al.
patent: 4127318 (1978-11-01), Determann et al.

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