Rotationally symmetric optical component composed of at least two lenses

Claim 2

An optical component for use in a system for optical imaging of a beam, comprising in combination: A. a base lens having an optical axis, and B. an annular corrective lens adjacent to the base lens, arranged in rotational symmetry relative to the optical axis, and forming an intermediate surface with the base lens, said intermediate surface being rotationally symmetric relative to the optical axis and being an annular section of a spherical surface having a radius, and said corrective lens and said base lens also jointly forming a spherical outer surface, the annular lens forming that part of the outer surface more distant from the optical axis and the base lens forming that part of the outer surface closer to the optical axis, the refractive indices of glasses used in the lenses and the radius of the annular section of the spherical surface being of a magnitude chosen such that only a small jump in deflection of the beam occurs at an edge of the annular section closest to the optical axis.

Claim 3

A component according to claim 1 wherein said base lens and said annular corrective lens define a concave outer surface, said outer surface being ground out of the part of said corrective lens closest to the optical axis to thereby cause the corrective lens to be annular.

Claim 4

A component according to claim 1 wherein said intermediate surface is a cemented surface.

Claim 5

A component according to claim 1 wherein said annular corrective lens comprises a plurality of rotationally symmetric annular lens components, said lens components being successively adjacent in a stack to form an additional intermediate surface between each pair of adjacent lens components, said additional intermediate surface being an annular section of a spherical surface.

Claim 6

A component according to claim 4 wherein said base lens and said annular corrective lens define a concave outer surface, said outer surface being ground out of the part of said corrective lens closest to the optical axis to thereby cause the corrective lens to be annUlar.

Claim 7

A component according to claim 4 wherein that edge of each annular section closest to the optical axis is substantially superimposed with each other such edge, and wherein each of those two surface sums Sigma T(1) and Sigma T(2) defined in the following equations (1) and (2) gives a corrected, small value, when compared to the size of the surface portions (sum-ends), the optical surfaces of said optical component being designated with consecutive numbers ranging from Alpha 1 to Alpha A:

Claim 8

An optical imaging system in the form of a six-lens Gauss-type objective, of which the optical component as defined in claim 6 is a part, the system further comprising two aspherical surfaces and having the following optical data: f 1.0, field angle 45*, aperture ratio 1:1.0 Surface a r ne ve No. 1 -0.7503 1.1506 1.8206 45.0 2 0.1296 4.5715 1.0 3 0.0006 0.5664 1.9006 40.4 4 0.2242 2.3972 1.7918 25.9 5 0.0412 0.3442 1.0 6 0.2860 -0.4429 1.8427 30.0 7 0.0306 1.3631 1.9006 40.4 8 0.1785 -0.6550 1.0 9 0.0006 1.1652 1.6940 54.5 10 0.1308 -1.0536 1.0 a1 referring to the distance between the surface No. 1 and the entry pupil of the objective, the surfaces No. 1 and No. 10 being aspherical and defined by the coefficients c(i) which are obtained through the development of the arc height c with the powers of b identical 1/2 L2, where L is the length of the chord, L identical Square Root y2+c2, representing the distance from the surface vertex to the point considered on the aspherical surface, y being the elevation, and c the arc height of the point, while the development of c defining the aspherical surface is as follows: c c(1)b+c(2)b2+c(3)b3+c(4)b4+c(5)b5+c(6)b6, the coefficient c(i) for the surfaces No. 1 and No. 10 being listed in the following table: Surface c(1) c(2) c(3) c(4) c(5)c(6) 0.869094 -0.188039 0.2 0 -16.0 100.0 10 -0.949170 1.889268 -11.34 -2.5 -4.0 4, 000.0 the surface No. 6 representing a concave, quasi-aspherical surface as part of the earlier-mentioned optical component, this optical component having three corrective lenses cemented to its base lens, its optical data being as follows: r6 -0.44292 n6a 1.90020 v6a 40.31 r6a -1.26142 n6b 1.70386 v6b 34.79 r6b 1.61477 n6c 1.92927 vbc 21.09 r6c 0.62069 n 1.84270 v 29.99 and the inner diameter of the corrective lenses being 0.4436.