Reverse Galilean finder with projected front window
AssigneeEastman Kodak Company
InventorsLee R. Estelle, William B. Jones, John D. Griffith
Life of this patent
Estimating the term…
Abstract
A reverse Galilean finder in which a front frame, preferably associated with a front element is projected away from the eye by the finder optics without separate frame projection optics to a position such that the distance between the apparent position of the frame to the eye and the rear vertex of the finder divided by the length of the finder is at least 2.2.
Claims16
A reverse Galilean finder having first, second and third elements from a front object side to a rear eye side, said first element having a front vertex at the surface facing the front object side and said third element having a rear vertex at the surface facing the rear eye side, a frame positioned on the object side of said first element substantially at the front vertex providing the entire framing function of the finder, the elements having powers and spacings which are chosen to project an apparent image of the frame away from an eye of a user such that a ratio D/LOV is greater than 2.2, where D is equal to the distance from said rear vertex to said apparent image and LOV is equal to the length of the finder from said front vertex to said rear vertex.
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 18.9706 4.500 1.492 57.4 2 ASPHERE 13.878 3 -12.2225 1.000 1.590 30.9 4 ASPHERE 5.183 5 24.9051 2.800 1.535 40.5 6 -11.3662 ______________________________________ ASPHERIC EQUATION:
- ##STR1## SURF. 2 C = 0.0517467 D = 0.11989E-03 k = -12.986 E = -0.41722E-06 SURF. 4 C = 0.1300001 D = -0.29085E-04 k = -0.7305 E = 0.85567E-06. ______________________________________
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 18.9706 3.000 1.492 57.4 2 ASPHERE 15.428 3 -12.1057 1.000 1.590 30.9 4 ASPHERE 5.116 5 24.6275 2.800 1.535 40.5 6 -11.3856 ______________________________________ ASPHERIC EQUATION:
- ##STR2## SURF. 2 C = 0.0481573 D = 0.976482E-04 k = -13.0817 E = -0.292343E-06 SURF. 4 C = 0.1300001 D = -0.108809E-03 k = -0.4968000 E = 0.318943E-06. ______________________________________
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 19.4598 3.000 1.492 57.4 2 ASPHERE 11.750 3 -14.1330 1.000 1.590 30.9 4 ASPHERE 5.253 5 19.0472 2.800 1.535 40.5 6 -12.3591 ______________________________________ ASPHERIC EQUATION:
- ##STR3## SURF. 2 C = 0.0.709620 D = 0.2578E-03 k = -10.62021 E = -0.1201E-05 SURF. 4 C = 0.1355730 D = -0.1247E-03 k = -0.3073000 E = 0.2070E-05. ______________________________________
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 20.0010 3.060 1.492 57.4 2 ASPHERE 11.258 3 -14.0564 1.000 1.590 30.9 4 ASPHERE 4.746 5 19.4728 3.800 1.535 40.5 6 -11.2489 ______________________________________ ASPHERIC EQUATION:
- ##STR4## SURF. 2 C = 0.0642385 D = 0.3112000E-03 F = 0.5395999E-08 k = -17.482000 E = -0.2331000E-05 SURF. 4 C = 0.1536098 D = 0.268000E-04 F = -0.1473000E-06 k = -1.0470000 E = 0.1017000E-04. ______________________________________
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 20.0010 3.000 1.492 57.4 2 ASPHERE 9.999 3 -12.5441 1.000 1.590 30.9 4 ASPHERE 6.014 5 31.8320 3.800 1.535 40.5 6 -11.7740 ______________________________________ ASPHERIC EQUATION:
- ##STR5## SURF. 2 C = 0.0579542 D = 0.13468E-03 F = 0.385230e-08 k = -8.6010 E = -0.14504E-05 SURF. 4 C = 0.1206870 D = 0.79148E-04 F = -0.20755E-06 k = -0.9551 E = 0.96225E-05. ______________________________________
A reverse Galilean finder constructed according to the following specifications wherein all distances are in millimeters, the index of refraction is for the D line of the spectrum and V is the abbe number:
- ______________________________________ SURF. RADIUS THICKNESS INDEX V ______________________________________ 1 * 1.000 2 41.8100 1.250 1.492 57.4 3 ASPHERE 12.469 4 -19.0065 1.000 1.492 57.4 5 7.7907 5.731 6 17.2674 2.000 1.492 57.4 7 -13.2751 ______________________________________ *Frame ASPHERIC EQUATION SURFACE 3 ##STR6## C = D = F = 0.102869582376 -1.682683178888E-04 -3.614091665108E-08 k = E = 0.033811605023 1.641004764352F-06. ______________________________________ *Frame
Dependencies are inferred from the claim text.