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US 4,054,370 AGranted
Full-focus eyepiece
AssigneeBell & Howell Company
InventorAndor A. Fleischman
Life of this patent
Estimating the term…
Abstract
An optical system for an eyepiece designed primarily to be used to observe an image formed by an optical instrument, such as an image intensifier, when viewing scenes under adverse or low light conditions. The system is designed with fewer elements than comparable designs of similar optical performance, and in the embodiments shown, five elements provide the required correction for high quality imaging of the viewed scene.
Claims3
An optical system for an eyepiece, having substantially the following specifications::
- ______________________________________ EFL = 1.0431 inches (26.50mm) Half Angle of Field = 25.61.degree. Thickness Spacing Lens Radii (in.) (in.) (in.) V N.sub.D ______________________________________ STOP S.sub.1 = 1.1810 L.sub.1 R.sub.1 = 2.173 R.sub.2 = 2.1730 T.sub.1 = 0.2758 54.8 1.691 S.sub.2 = .0070 L.sub.2 R.sub.3 = 0.7640 R.sub.4 = -8.6130 T.sub.2 = 0.4140 54.8 1.691 S.sub.3 = 0 L.sub.3 R.sub.5 = 8.6130 R.sub.6 = -0.5420 T.sub.3 = 0.0700 25.4 1.805 S.sub.4 = .1160 L.sub.4 R.sub.7 = 0.8494 R.sub.8 = 3.8610 T.sub.4 = 0.2130 51.7 1.734 S.sub.5 = .0840 L.sub.5 R.sub. 9 = -0.9400 R.sub.10 = Inf. T.sub.5 = 0.0600 25.4 1.805 S.sub.6 = .1885 BFL ______________________________________
- wherein the first column lists the lens elements L.sub.1 to L.sub.5 numerically, starting at the ray entrance side of the system. The second column lists the respective radii R.sub.1 to R.sub.10 of the elements, the third column lists in inches the thicknesses T.sub.1 to T.sub.5 of the respective elements, the fourth column lists the axial spacings (in inches) between the respective elements and the image plane at which the light rays are imaged for viewing, and the fifth and sixth columns list respectively the dispersive index V and the refractive index N.sub.D of the optical materials.
An optical system for an eyepiece, having substantially the following specifications:
- ______________________________________ EFL = 1.0433 inches (26.50mm) Half Angle of Field = 25.61.degree. Thickness Lens Radii (in.) (in.) Spacing (in.) V N.sub.D ______________________________________ STOP S.sub.1 = 1.1810 L.sub.1 R.sub.1 = 2.1391 T.sub.1 = .2900 54.8 1.691 R.sub.2 = 2.1391 S.sub.2 = .0070 L.sub.2 R.sub.3 = 0.7732 T.sub.2 = .4013 54.8 1.691 R.sub.4 = -11.0296 S.sub.3 = 0 L.sub.3 R.sub.5 = 11.0296 T.sub.3 = .0700 25.4 1.805 R.sub.6 = -0.5558 S.sub.4 = .1160 L.sub.4 R.sub.7 = .9058 T.sub.4 = .2202 50.5 1.788 R.sub.8 = 6.0374 S.sub.5 = .0903 L.sub.5 R.sub.9 = -0.9763 T.sub.5 = .0600 25.4 1.805 R.sub.10 = Inf. S.sub.6 = .1892 BFL ______________________________________
- wherein the first column lists, the lens elements L.sub.1 to L.sub.5 numerically, starting at the ray entrance side of the system, the second column lists the respective radii R.sub.1 to R.sub.10 of the elements, the third column lists in inches the thicknesses T.sub.1 to T.sub.5 of the respective elements, the fourth column lists the axial spacings (in inches ) between the respective elements and the image plane at which the light rays are imaged for viewing, the fifth and sixth columns list respectively the dispersive index V and the refractive index N.sub.D of the optical materials.
An optical system for an eyepiece, having substantially the following specifications:
- ______________________________________ EFL = 1.0433 inches (26.50mm) Half Angle of Field = 25.61.degree. Thickness Lens Radii (in.) (in.) Spacing (in.) V N.sub.D ______________________________________ STOP S.sub.1 = 1.1810 L.sub.1 R.sub.1 = 2.1372 T.sub.1 = .2900 54.8 1.691 R.sub.2 = 2.1372 S.sub.2 = .0070 L.sub.2 R.sub.3 = 0.7453 T.sub.2 = .3820 54.8 1.691 R.sub.4 = -3.0776 S.sub.3 = 0 L.sub.3 R.sub.5 = 3.0776 T.sub.3 = .0700 23.8 1.847 R.sub.6 = -0.5473 S.sub.4 = .1172 L.sub.4 R.sub.7 = .8695 T.sub.4 = .2253 50.5 1.788 R.sub.8 = 6.5074 S.sub.5 = .0934 L.sub.5 R.sub.9 = -0.9568 T.sub.5 = .0600 23.8 1.847 R.sub.10 = Inf. S.sub.6 = .1894 BFL ______________________________________
- wherein the first column lists the lens elements L.sub.1 to L.sub.5 numerically, starting at the ray entrance side of the system, the second column lists the respective radii R.sub.1 to R.sub.10 of the elements, the third column lists in inches the thicknesses T.sub.1 to T.sub.5 of the respective elements, the fourth column lists the axial spacings (in inches) between the respective elements and the image plane at which the light rays are imaged for viewing, and the fifth and sixth columns list respectively the dispersive index V and the refractive index N.sub.D of the optical materials.
Dependencies are inferred from the claim text.