Microscope objective lens

Abstract

The invention discloses a microscope objective lens. The microscope objective lens comprises a first lens group having positive refraction focal power on the whole and a second lens group having negative refraction focal power on the whole which are sequentially arranged from the object side, wherein the first lens group is composed of a first doublet lens group, a third single lens, a fourth single lens, a second doublet lens group, a third doublet lens group and a first triplet lens group which are sequentially arranged from the object side; and the second lens group is composed of a secondtriplet lens group and a fifteenth single lens which are sequentially arranged from the object side. The numerical aperture can reach about 1.5 under a condition that the amplification factor of the microscope object lens is -100x and the image-side linear view field is 25mm through setting at least one of the third single lens and the fourth single lens to be a positive meniscus lens; the tolerance sensitivity of all lenses is reduced while the imaging quality is improved, and the qualified rate of the objective lens is improved; and a diffraction element in the combined lens is removed, so that the processing difficulty and the processing cost are reduced.

Description

technical field [0001] The invention relates to an optical lens, in particular to a microscope objective lens. Background technique [0002] Microscope is currently the most common tool for humans to explore the microscopic world, and the microscope objective lens is one of the most important optical devices that constitute a microscope. In the field of biomedicine, in order to observe tiny organisms and their tissue structures more directly, it is necessary to use microscope objectives with high magnification, large numerical aperture, flat field, and apochromatic. The general microscope objective lens uses air as the medium, and the maximum numerical aperture can only be close to 1 in theory. Therefore, in order to increase the resolution and increase the numerical aperture, it is necessary to replace the air medium with a liquid with a refractive index of about 1.5. The numerical aperture is about 1.3. However, when the numerical aperture increases, the depth of focus d...

AI Technical Summary

Problems solved by technology

However, when the numerical aperture increases, the depth of focus decreases and the correction of chromatic aberration becomes difficult. In order to solve this problem, Nikon’s high-magnification objective lenses use diffractive optical elements, which undoubtedly increases the difficulty of processing and increases the cost of the objective lens.

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