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US 5,515,209 AGranted
Light-weight high-magnification clinical viewer
AssigneeOrascoptic Research, Inc.
InventorsRichard A. Buchroeder, Charles H. Caplan
Life of this patent
Estimating the term…
Abstract
The light-weight high-magnification clinical viewer includes a three-element objective lens and a two-element eyepiece lens. Use of multiple lenses allows for a more compact package. The doublet eyepiece lens serves to reduce chromatic aberration at high magnification. The triplet objective serves to avoid vignetting while providing a wide field of view and reduced chromatic aberration. Image quality is further enhanced, while keeping the weight of the viewer down, through the use in the objective of light-weight high index glass.
Claims3
A magnification viewer having a two-element eyepiece lens and a three-element objective lens;
- the magnification viewer having the design parameters represented in the following table:
- ______________________________________ Viewer with Exemplary Standard Working Distance Element n.sub.d v.sub.d Radius Thickness Separation ______________________________________ I 1.805 25.4 R.sub.1 = -24.420 T.sub.1 = 2.2 S.sub.1 = 23.80 R.sub.2 = -14.532 S.sub.2 = 0.50 II 1.517 64.2 R.sub.2 = -14.532 T.sub.2 = 1.2 R.sub.3 = 17.620 III 1.517 64.2 R.sub.4 = FLAT T.sub.3 = 4.0 R.sub.5 = -30.786 IV 1.805 25.4 R.sub.6 = -70.775 T.sub.4 = 1.5 R.sub.7 = 156.062 V 1.607 56.7 R.sub.7 = 156.062 T.sub.5 = 4.8 R.sub.8 = -34.683 ______________________________________
- wherein the Roman numerals I and II identify the two lens elements of the eyepiece lens, and the Roman numerals III-V identify the three lens elements of the objective lens, from the eyepoint side to the object side;
- n.sub.d represents the refractive index of each element;
- v.sub.d is the Abbe dispersion number;
- R.sub.1 -R.sub.8 represent the radii, in millimeters, of the respective refractive surfaces, in order, from the eyepoint side to the object side;
- T.sub.1 -T.sub.5 and S.sub.1 -S.sub.2 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.
4 more elements
A magnification viewer having a two-element eyepiece lens and a three-element obiective lens;
- the magnification viewer having the design parameters represented in the following table:
- ______________________________________ Element n.sub.d v.sub.d Radius Thickness Separation ______________________________________ I 1.805 25.4 R.sub.1 = -21.900 T.sub.1 = 2.2 S.sub.1 = 23.81 R.sub.2 = 13.500 S.sub.2 = 0.50 II 1.517 64.2 R.sub.2 = -13.500 T.sub.2 = 1.2 R.sub.3 = 17.500 III 1.517 64.2 R.sub.4 = FLAT T.sub.3 = 4.0 R.sub.5 = -30.786 IV 1.805 25.4 R.sub.6 = -70.775 T.sub.4 = 1.5 R.sub.7 = 156.062 V 1.607 56.7 R.sub.7 = 156.062 T.sub.5 = 4.8 R.sub.8 = -34.683 ______________________________________
- wherein the Roman numerals I and II identify the two lens elements of the eyepiece lens, and the Roman numerals III-V identify the three lens elements of the objective lens, from the eyepoint side to the object side;
- n.sub.d represents the refractive index of each element;
- v.sub.d is the Abbe dispersion number;
- R.sub.1 -R.sub.8 represent the radii, in millimeters, of the respective refractive surfaces, in order, from the eyepoint side to the object side;
- T.sub.1 -T.sub.5 and S.sub.1 -S.sub.2 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.
4 more elements
A magnification viewer having a two-element eyepiece lens and a three-element objective lens;
- the magnification viewer having the design parameters represented in the following table:
- ______________________________________ Element n.sub.d v.sub.d Radius Thickness Separation ______________________________________ I 1.805 25.4 R.sub.1 = -20.230 T.sub.1 = 2.2 S.sub.1 = 23.82 R.sub.2 = -12.700 S.sub.2 = 0.50 II 1.517 64.2 R.sub.2 = -12.700 T.sub.2 = 1.2 R.sub.3 = 17.300 III 1.517 64.2 R.sub.4 = FLAT T.sub.3 = 4.0 R.sub.5 = -30.786 IV 1.805 25.4 R.sub.6 = -70.775 T.sub.4 = 1.5 156.062 V 1.607 56.7 R.sub.7 = 156.062 T.sub.5 = 4.8 R.sub.8 = -34.683 ______________________________________
- wherein the Roman numerals I and II identify the two lens elements of the eyepiece lens, and the Roman numerals III-V identify the three lens elements of the objective lens, from the eyepoint side to the object side;
- n.sub.d represents the refractive index of each element;
- v.sub.d is the Abbe dispersion number;
- R.sub.1 -R.sub.8 represent the radii, in millimeters, of the respective refractive surfaces, in order, from the eyepoint side to the object side;
- T.sub.1 -T.sub.5 and S.sub.1 14 S.sub.2 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.
4 more elements
Dependencies are inferred from the claim text.