UV-capable dry lens for microscopes

Details UV-capable dry lens for microscopes UV-capable dry lens for microscopes

1990-05-15

1992-04-07

Sugarman, Scott J.

Optical: systems and elements

Lens

Microscope objective

359350, 359354, 359658, G02B 2102, G02B 1514

Patent

active

051033410

ABSTRACT:
An UV-capable dry objective for microscopes in which aperture aberration is corrected, at the same time, both for the visible spectrum and for a selected UV-wavelength. The objective comprises two lens groups separated by an air gap which is varied in size by relative movement between the two lens groups. The size of the air gap is adjusted to correct aperture aberration for the selected UV-wavelength. The objective is designed so that the mathematical sign is the same for both (i) the corrections required as the illumination moves toward the longer-wave portion of the visible spectrum, and (ii) for the corrections required as the illumination moves toward the shorter-wave portion of the UV-spectrum. The objective has an aperture of at least 0.7 and a magnification of more than 60.times..

REFERENCES:
patent: 4009945 (1977-03-01), Klein
patent: 4046460 (1977-09-01), Koizumi
patent: 4059342 (1977-11-01), Tojyo
patent: 4200352 (1980-04-01), Yuta
patent: 4403835 (1983-09-01), Ushida
patent: 4666256 (1987-05-01), Shimizu et al.
patent: 4770477 (1988-09-01), Shafer

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