Optical: systems and elements – Lens – Microscope objective
Patent
1992-10-28
1993-12-14
Arnold, Bruce Y.
Optical: systems and elements
Lens
Microscope objective
359656, 359772, G02B 2102, G02B 934
Patent
active
052708608
ABSTRACT:
The invention relates to an objective-with-a-corrector-ring for microscopes that is of about 40 magnifications and has an NA of 0.93 with well-corrected aberrations over an ultra-wide field range, and is less likely to degrade in performance due to a thickness variation of the cover glass. This objective comprises a first lens group G1 that includes a positive meniscus lens concave on the object side and has positive refracting power as a whole, a second lens group G2 that is movable along the optical axis and has small refracting power, a third lens group G3 that is of positive refracting power and converts an exit luminous flux leaving the object and passing through said first and second lens groups to a converging flux, and a fourth lens group G4 that includes two lens surfaces opposite on the concave surfaces to each other through an air separation. The second lens group is movable relative to the first and third lens groups depending on a thickness change of the cover glass.
REFERENCES:
patent: 4280757 (1981-07-01), Tojo
patent: 4505553 (1985-03-01), Asoma
patent: 4953962 (1990-09-01), Esswein et al.
English abstract of JP 57-148717, Sep. 1982.
English abstract of JP 59-100409, Jun. 1984.
English abstract of JP 61-275812, Dec. 1986.
Arnold Bruce Y.
Olympus Optical Co,. Ltd.
Parsons David R.
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