Optical: systems and elements – Compound lens system – Microscope
Reexamination Certificate
2005-08-19
2010-11-30
Allen, Stephone B (Department: 2872)
Optical: systems and elements
Compound lens system
Microscope
C250S201300, C250S201400, C250S201700, C250S461100
Reexamination Certificate
active
07843634
ABSTRACT:
An AF dark field illumination device and an objective lens are moved in unity. A tissue sample in a Petri dish is illuminated by infrared light incident with an oblique angle from an LED light source. The casting of the infrared light causes scattered light from the tissue sample. A part of the scattered light passes through the objective lens, thereby forming a dark-field microscope image, which is captured by a CCD camera. The sharpness of the dark-field microscope image is dependent upon the position of the objective lens. The position of the objective lens at which the dark-field microscopic image exhibits the highest sharpness is determined to be the focus position.
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Allen Stephone B
Chapel Derek S
Miles & Stockbridge P.C.
Nikon Corporation
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