Single optical lens with large aperture and large field

Claim 2

A single lens, wherein an expression for the wave front aberration is represented by a series expansion as a function of the aperture, terms of high degree being utilized, the single lens having spherical refractive surfaces, whose parameters are given by the co-ordinates of a point of the region which is bounded in the plane with the coordinate axes ##EQU8## by two straight lines with the respective equations: ##EQU9## and which is situated between these two straight lines, each of the refractive surfaces being of an aspherical shape for minimizing wave-front aberration, the aspherization of the refractive surfaces being expanded in a series which contains terms of at least the sixth degree as a function of the distance between the points of the refractive surface and the axis of revolution to the lens, where n is the refractive index, e is the thickness, f is the focal length, and C 1 , C 2 are the osculation curvatures of the refractive faces of the lens.

Claim 3

A single lens as claimed in claim 1, wherein the medium at the object side and that at the image side have different refractive indexes.

Claim 4

A lens as recited in claim 1, comprising two deposited layers of a plastics material, each at one end of a transparent base material, the outer surfaces of each of said layers are aspherical in accordance with the characteristics recited in claim 1.

Claim 5

A single lens as claimed in claim 1, wherein the material is a plastic molding material.

Claim 6

A single lens as claimed in claim 1, wherein it complies with the specifications of the following Table: TABLE I ______________________________________ n = 1.7 C.sub.2 /C.sub.1 = 0.284 free image distance: 2.6688 mm C.sub.1 = 0.2068086 mm.sup.-.sup.1 free object distance:-160 mm C.sub.2 = 0.0586528 mm.sup.-.sup.1 γ= - 0.0565 e = 8.184 mm f = 7.5573 mm ##STR2## Coefficients k and e Refractive surface 11 Refractive surface 12 ______________________________________ k -0.258 k -1 ε.sub.2 -0.7179284 10.sup.-.sup.4 ε.sub.2 0.8844274 10.sup.-.sup.2 ε.sub.3 -0.2367655 10.sup.-.sup.5 ε.sub.3 0.5837108 10.sup.-.sup.4 ε.sub.4 0.9787664 10.sup.-.sup.6 ε.sub.4 0.1042128 10.sup.-.sup.2 ε.sub.5 -0.262211 10.sup.-.sup.6 ε.sub.5 -0.1625183 10.sup.-.sup.2 ε.sub.6 0.3795457 10.sup.-.sup.7 ε.sub.6 -0.1586676 10.sup.-.sup.2 ε .sub.7 -0.3174790 10.sup.-.sup.8 ε.sub.7 -0.8957358 10.sup.-.sup.3 ε.sub.8 0.1535543 10.sup.-.sup.9 ε.sub.8 0.2977601 10.sup.-.sup.3 ε.sub.9 -0.3983771 10.sup.-.sup.11 ε.sub.9 -0.5380995 10.sup.-.sup.4 ε.sub.10 0.4301476 10.sup.-.sup.13 ε.sub.10 0.4125182 10.sup.-.sup.5 ______________________________________ , where k is a specific coefficient of a conic section with the special values k = 0 for a circle and k = -1 for a parabola, where Ξ= a magnification factor and the coefficients ε i are coefficients of aspherization.

Claim 7

A single lens as claimed in claim 1, wherein it complies with the specifications of the following Table: TABLE II ______________________________________ n = 1.5 C.sub.2 /C.sub.1 = 0.202 free object distance: -160 mm C.sub.1 = 0.2912733 mm.sup.-.sup.1 free image distance: 3.63171 mm C.sub.2 = 0.0582546 mm.sup.-.sup.1 e = 5.835 f = 7.51829 γ = 0.0495825 Coefficients k and ε.sub.i Refractive surface 11 Refractive surface 12 ______________________________________ k -0.291 k -1 ε.sub.2 -0.1926581 10.sup.-.sup.3 ε.sub.2 0.1079271 10.sup.-.sup.1 ε.sub.3 -0.1537706 10.sup.-.sup.4 ε.sub.3 0.1515678 10.sup.-.sup.2 ε.sub.4 0.8695365 10.sup.-.sup.5 ε.sub.4 -0.1388911 10.sup.-.sup.2 ε.sub.5 -0.2938304 10.sup.-.sup.5 ε.sub.5 -0.2261891 10.sup.-.sup.2 ε.sub.6 0.6086732 10.sup.-.sup.6 ε.sub.6 -0.1953849 10.sup.-.sup.2 ε.sub.7 -0.7359854 10.sup.-.sup.7 ε.sub.7 0.1053471 10.sup.-.sup.2 ε.sub.8 0.6318046 10.sup.-.sup.8 ε.sub.8 -0.3237450 10.sup.-.sup.3 ε.sub.9 -0.2886018 10.sup.-.sup.9 ε.sub.9 0.5091558 10.sup.-.sup.4 ε.sub.10 0.5788596 10.sup.-.sup.11 ε.sub.10 -0.2840845 10.sup.-.sup.5 ______________________________________ , where k is a specific coefficient of a conic section with the special values k = 0 for a circle and k = -1 for a parabola, where Ξ=a magnification factor and the coefficients ε i are coefficients of aspherization.