Optical: systems and elements – Compound lens system – Microscope
Reexamination Certificate
2005-09-13
2005-09-13
Sikder, Mohammad (Department: 2872)
Optical: systems and elements
Compound lens system
Microscope
C359S388000, C359S386000, C359S387000
Reexamination Certificate
active
06943943
ABSTRACT:
An illuminating apparatus for a microscope comprises a condenser lens for condensing beams of illumination light from a light source and a pin-hole stop. The pin-hole stop has a pin-hole, provided on an optical axis, for transmitting only strong light beams from a central portion of the light source among the illumination light beams condensed by the condenser lens. The pin-hole stop also has a light reducing/illumination area, disposed around the pin-hole in symmetry with respect to the optical axis, for illuminating the periphery of an on-specimen portion illuminated with the light beams passing through the pin-hole with a quantity of light exhibiting a predetermined ratio to a quantity of the light passing through the pin-hole. The same apparatus also comprises an objective lens for converging the illumination light beams passing through this pin-hole stop on a specimen. The pin-hole stop is located in a position substantially conjugate to a pupil plane of the objective lens.
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patent: 0040541 (1978-04-01), None
Nikon Corporation
Sikder Mohammad
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