Patent ID: 6061189
Filing Date: 2000-05-09
Classification: G02B,G02C

Abstract:
A magnification viewer system adapted to be carried by a pair of spectacles including one or more spectacle lenses, comprising:one or more magnification viewers, each viewer having an eyepiece lens and a doublet objective lens carried by a mounting barrel, said mounting barrel attachable at an eyepiece end to said one or more spectacle lenses;wherein the viewer has the design parameters represented in the following table: Element n.sub.d v.sub.d Radius Thickness Separation  I 1.517 64.2 R.sub.1 = 28.12 T.sub.1 = 1.5 S.sub.1 = 13.97 R.sub.2 = 28.12 II 1.805 25.4 R.sub.3 = 121.40 T.sub.2 = 1.5 R.sub.4 = 49.28 III 1.607 56.7 R.sub.4 = 49.28 T.sub.3 = 5.8 R.sub.5 = 27.50  wherein the Roman numerals I identifies the lens element of a single element eyepiece lens and the Roman numerals II and III identify two lens elements of an objective lens, from eyepoint side to object side; nd represents the refractive index of each element; v.sub.d is the Abbe dispersion number; R1-R5 represent the radii, in millimeters, of respective refractive surfaces, in order, from the eyepoint side to the object side; T1-T3 and S1 represent the thicknesses, in millimeters, of the lens elements and air spaces, respectively, from the eyepoint side to the object side measured along an optical centerline.