Olympus Optical Company, Ltd.

Tsutomu Tojo

Toshifumi Uetake

An objective lens system for microscopes comprising a front lens group consisting of a first positive cemented doublet component, a second positive single-element or cemented doublet component and a third positive single-element or cemented doublet component, and a rear lens group consisting only of a negative three-element cemented lens component, said objective lens system having a large N.A. value and being so adapted as to be usable for fluorescence microscopy by using a glass material showing, at a thickness of 10 mm, a transmittance of 80% or higher at wavelength .lambda.=365 nm which enhances transmittance of the entire lens system above 60%.

Objective lens system for microscopes

An objective lens system for microscopes comprising a front lens group consisting of a first positive meniscus lens component and a second positive cemented doublet component, and a rear lens group consisting of a third lens component having positive refractive power and a fourth lens component having positive refractive power, said objective lens system having a sufficiently large NA and being made of a glass material showing high transmittance for rays at short wavelengths.

An achromat microscope objective with high magnification comprising a first, second, third and fourth lens components, the first lens component being a comparatively thick meniscus lens, the second lens component being a positive meniscus lens with comparatively small thickness, the third lens component being a cemented doublet, the fourth lens component being a cemented doublet, aberrations especially astigmatic difference and curvature of field of the microscope objective being corrected favorably.

Microscope objective

An objective lens system for microscopes which has a large numerical aperture and a long working distance and wherein the secondary spectrum is sufficiently minimized and curvature of field, coma, etc. are favorably corrected over a wide range of visual field. Said objective lens system comprises a first single-element or cemented doublet lens component and at least three lens components, i.e., two cemented meniscus lens components so arranged as to face their concave surfaces each other and a cemented three-element lens component.

An objective lens system for microscopes consisting of a front lens group comprising a positive lens component and a meniscus lens component having a concave surface on the image side, and a rear lens group comprising at least a meniscus cemented lens component, a positive lens component and at least one cemented three-element lens component. Said objective lens system is so designed as to have a large numerical aperture, secondary spectrum sufficiently minimized, a long working distance and curvature of field, coma etc. favorably corrected over a wide range of visual field.

A microscope objective lens system which comprises a first lens component of a positive lens, a second lens component of a positive meniscus lens having its convex surface faced to the object side, a third lens component of a negative lens, a fourth lens component of a positive meniscus lens having its concave surface faced to the object side, and fifth lens component of a double-convex lens, in which image plane through the objective lens system can coincide with a reverse-traced image plane through an eyepiece lens system and which enables observation with a flat image plane through the eyepiece lens system.

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Hachiouji, Japan

Tsutomu Tojo