Showing papers on "Apochromat published in 1984"
TL;DR: A model is proposed for spherical aberration in a single radial gradient-rod lens, and the refractive-index coefficients up to sixth order are estimated by ray trace analysis.
Abstract: A model is proposed for spherical aberration in a single radial gradient-rod lens. The aberration on a near one-quarter pitch lens is evaluated by employing the model, and the refractive-index coefficients up to sixth order estimated by ray trace analysis.
10 citations
TL;DR: The classical spherical aberration structural coefficient for a plano-convex lens is compared to one derived via Fourier optics in this paper, and the effects of these differences on diffraction are then studied in the maximum Strehl planes.
Abstract: The classical spherical aberration structural coefficient for a plano-convex lens is compared to one derived via Fourier optics. The effects of these differences on diffraction are then studied in the maximum Strehl planes.
5 citations
Patent•
24 Jan 1984
TL;DR: In this paper, the authors proposed a six-group microscope objective lens consisting of the 1st meniscus single lens group having a concave surface facing an object side, the 2nd biconvex single lens groups, the 3rd combined lens group of a biclvex lens and a meniscous concave lens, the 4th single lens Group having a relatively intense concave surfaces facing to the object side and the 5th lens Group of a two-element combined lens of a concava and a convex lens, and the 6th b
Abstract: PURPOSE:To obtain a microscope objective lens which is an apochromat, but has enough flatness of an image surface by allowing the microscope objective lens of six-group constitution to meet specific requiremetns. CONSTITUTION:This microscope objective lens consists of the 1st meniscus single lens group having a concave surface facing an object side, the 2nd biconvex single lens group, the 3rd combined lens group of a biconvex lens and a meniscus concave lens, the 4th single lens group having a relatively intense concave surface facing to the object side, the 5th lens group of a two-element combined lens of a concave and a convex lens or three-element combined lens of a concave, a convex, and a concave lens, and the 6th biconvex single lens group. Then, inequalities are satisfied. In the inequalities, (f), fF, fR, and f4 are the focal length of the whole system, the composite focal length of the 1st- the 4th lens groups, the composite focal length of the 5th and the 6th lens groups, and the focal length of the 4th lens group, and d1 is the thickness of the 1st lens group; and n1, n4, and n5 are the refractive indexes of the 1st, the 3rd, and the 4th lens groups, and nu4 is the Abbe number of the image-side lens in the 3rd lens group.
2 citations
TL;DR: In this article, the relations between aberration coefficients for different object position have been obtained in electron optics either by direct use of the eikonal or by examining the aberration integrals.