Microscope objective lens system with correction ring

Optical: systems and elements – Lens – Microscope objective

Patent

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Details

359657, 359658, G02B 2102

Patent

active

057399581

ABSTRACT:
A microscope objective lens system comprising a first lens unit which comprises a positive meniscus lens component having a concave surface on the object side and has a positive refractive power, a second lens unit which comprises a diverging cemented surface and has a positive refractive power, a third lens unit which comprises surfaces having strongly diverging functions and has a negative refractive power, and a fourth lens unit which has a negative refractive power; and configured so as to allow the second lens unit to be moved relatively to the first lens unit and the third lens unit in conjunction with thickness of a transparent plane parallel plate disposed between a surface of an object to be observed and the first lens unit, thereby correcting variations of aberrations caused due to changes in thickness of plane parallel plates.

REFERENCES:
patent: 4232940 (1980-11-01), Nakagawa
patent: 4505553 (1985-03-01), Asoma
patent: 4537472 (1985-08-01), Asoma
patent: 4591243 (1986-05-01), Yamagishi
patent: 5444573 (1995-08-01), Saito

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