Optical: systems and elements – Compound lens system – Microscope
Patent
1994-12-16
1998-05-12
Nguyen, Thong
Optical: systems and elements
Compound lens system
Microscope
359371, 359386, G02B 2106
Patent
active
057514755
ABSTRACT:
A phase contrast microscope including an illuminating optical system, a ring slit arranged at a pupil of the illuminating optical system, an imaging optical system, and a phase plate arranged at a pupil of the imaging optical system which is conjugate with the pupil of the illuminating optical system with respect to a specimen plane on which a specimen under inspection is placed. The phase plate is formed by a liquid crystal and a pair of transparent ring-shaped electrodes arranged on both sides of the liquid crystal. A voltage applied across the liquid crystal via the electrodes is changed such that a phase difference introduced by the phase plate is set to .+-..pi./2 to obtain a dark contrast image and a bright contrast image. A difference between these dark and bright contrast images is derived to obtain a phase contrast image having high contrast and resolution.
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Ishiwata Hiroshi
Nagano Chikara
Nguyen Thong
Olympus Optical Co,. Ltd.
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