Optical: systems and elements – Lens – Microscope objective
Patent
1993-11-23
1995-11-21
Nguyen, Thong Q.
Optical: systems and elements
Lens
Microscope objective
359355, 359357, 359656, G02B 2102, G02B 1314
Patent
active
054692997
ABSTRACT:
A high resolution objective lens system for use in the ultraviolet region around 250 nm comprising in order from the object side: a first lens unit comprising a meniscus lens component having an object side concave surface having high curvature and a positive lens component, and having a positive refractive power as a whole; a second lens unit comprising at least two cemented lens components and having a positive refractive power as a whole; and a third lens unit comprising a cemented lens component and having a negative refractive power as a whole: each of the lens elements arranged in the lens units being made of an optical material which has, a thickness of at least 5 mm, and an internal transmittance of at least 50% for a ray having a wavelength of 300 nm.
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L. V. Foster, et al., "An Achromatic Ultraviolet Microscope Objective", J.O.S.A., vol. 38, pp. 689-692, Aug. 1948.
Nguyen Thong Q.
Olympus Optical Co,. Ltd.
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