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US4331391A Expired / Lapsed US ⏱️ 0.0 years remaining

Lens system having wide angle objectives

Assignee: United States Department of the Air Force
•
Filing: 1980-05-16
•
Granted: 1982-05-25
•
Expires: 2000-05-16
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Abstract

Abstract Wide angle optical objectives for use in aerial mapping cameras to provide improved resolving power and improved contrast rendition derived from the pattern of glass types and lens data employed. The outermost elements are weakly positive menisci to produce an initial convergence of rays before the mating negative elements are introduced thereby keeping the physical length of the system within modest proportions. Strong negative elements lying outside of centrally located strong positive elements provide favorable illumination over a wide angle field. Wafer elements near the center of the system serve to minimize chromatic astigmatism and to reduce the actual sagittal depth of the aspherics. Wafers of high index flint glass are located next to the central stop in order to obtain good chromatic spherical correction in the tangential rays over the field.

Inventors

  • 👤 James G. Baker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 05:00
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/18; G02B9/00; G02B9/64

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 337 words
A lens system having wide angle objectives having numerical data substantially as follows: ______________________________________ (C.F.I. = 1.0000 E.F.L. = 1.0000 f/4.937) Element Radii Thicknesses n.sub.d γ.sub.d Type ______________________________________ R.sub.1 = 0.4832 I t.sub.1 = 0.1016 1.6433 47.76 643478 R.sub.2 =0.6274 S.sub.1 = 0.0773 R.sub.3 = 1.4230 II t.sub.2 = 0.0323 1.7550 53.28 755533 R.sub.4 = 0.3337 S.sub.2 = 0.1054 R.sub.5 = 0.4398 III t.sub.3 = 0.0836 1.8807 41.06 881411 R.sub.6 = 1.2063 S.sub.3 = 0.0523 R.sub.7 = 2.0510 IV t.sub.4 = 0.0378 1.6129 36.95 613370 R.sub.8 = 0.1739 V t.sub.5 = 0.0884 1.5567 58.54 557585 R.sub.9 = 1.0724 VI t.sub.6 = 0.0189 1.7755 37.90 776379 R.sub.10 = 3.1058 VII t.sub.7 = 0.0243 1.7847 26.10 785261 R.sub.11 = Ashp. S.sub.4 = 0.0621 R.sub.12 = Ashp. VIII t.sub.8 = 0.0243 1.7847 26.10 785261 R.sub.13 = -3.1058 IV t.sub.9 = 0.0189 1.8807 41.06 881411 R.sub.14 = -1.0724 X t.sub.10 = 0.0938 1.5567 58.54 557585 R.sub.15 = -0.1739 XI t.sub.11 = 0.0323 1.6129 36.95 613370 R.sub.16 = -2.0510 S.sub.5 = 0.0709 R.sub.17 = -1.9043 XII t.sub.12 = 0.0852 1.8807 41.06 881411 R.sub.18 = -0.4931 S.sub.6 = 0.2229 R.sub.19 = -0.3584 XIII t.sub.13 = 0.0323 1.7885 50.45 789505 R.sub.20 = -1.1833 S.sub.7 = 0.0018 R.sub.21 = -1.1792 XIV t.sub.14 = 1.64330 47.76 643478 R.sub.22 = -1.2623 S.sub.8 = 0.3225 ______________________________________ wherein the stop lies between R.sub.11 and R.sub.12 and has a clear aperture of 0.1852 at a distance along the axis of 0.0204 from R.sub.11, and surfaces 11 and 12 above are both aspheric, have coefficients taken from the equation below, and have the following shapes for a 94degree ful field: C.sub.11 = 0.054683 β.sub.11 = 0.32272 γ.sub.11 = -38.786 δ.sub.11 = 638.12 ε.sub.11 = -10643 C.sub.12 = 0.183844 β.sub.12 = 1.39282 γ.sub.12 = 36.356 δ.sub.12 = -720.12 ε.sub.12 = 15382 ##STR1## where C.sub.i is the curvature of the ith surface, β.sub.i, γ.sub.i, δ.sub.i, and ε.sub.i (beta.sub.i, gamma.sub.i, delta.sub.i and epsilon.sub.i) are the coefficients of the aspheric polynomial terms, and ξ.sub.i (xi.sub.i) and η.sub.i (eta.sub.i) are the sagitta and zone height respectively.
Claim 2
Dependent Claim 337 words
A lens system having wide angle objectives having numerical data substantially as follows: ______________________________________ (C.F.I. = 1.0000 E.F.L. = 1.0000 f/4.937) Element Radii Thicknesses n.sub.d γ.sub.d Type ______________________________________ R.sub.1 = 0.4832 I t.sub.1 = 0.1016 1.6433 47.76 643478 R.sub.2 =0.6274 S.sub.1 = 0.0773 R.sub.3 = 1.4230 II t.sub.2 = 0.0323 1.7550 53.28 755533 R.sub.4 = 0.3337 S.sub.2 = 0.1054 R.sub.5 = 0.4398 III t.sub.3 = 0.0836 1.8807 41.06 881411 R.sub.6 = 1.2063 S.sub.3 = 0.0523 R.sub.7 = 2.0510 IV t.sub.4 = 0.0378 1.6129 36.95 613370 R.sub.8 = 0.1739 V t.sub.5 = 0.0884 1.5567 58.54 557585 R.sub.9 = 1.0724 VI t.sub.6 = 0.0189 1.7755 37.90 776379 R.sub.10 = 3.1058 VII t.sub.7 = 0.0243 1.7847 26.10 785261 R.sub.11 = Ashp. S.sub.4 = 0.0621 R.sub.12 = Ashp. VIII t.sub.8 = 0.0243 1.7847 26.10 785261 R.sub.13 = -3.1058 IV t.sub.9 = 0.0189 1.8807 41.06 881411 R.sub.14 = -1.0724 X t.sub.10 = 0.0938 1.5567 58.54 557585 R.sub.15 = -0.1739 XI t.sub.11 = 0.0323 1.6129 36.95 613370 R.sub.16 = -2.0510 S.sub.5 = 0.0709 R.sub.17 = -1.9043 XII t.sub.12 = 0.0852 1.8807 41.06 881411 R.sub.18 = -0.4931 S.sub.6 = 0.2229 R.sub.19 = -0.3584 XIII t.sub.13 = 0.0323 1.7885 50.45 789505 R.sub.20 = -1.1833 S.sub.7 = 0.0018 R.sub.21 = -1.1792 XIV t.sub.14 = 1.64330 47.76 643478 R.sub.22 = -1.2623 S.sub.8 = 0.3225 ______________________________________ wherein the stop lies between R.sub.11 and R.sub.12 and has a clear aperture of 0.1852 at a distance along the axis of 0.0204 from R.sub.11, and surfaces 11 and 12 above are both aspheric, have coefficients taken from the equation below, and have the following shapes for a 94degree ful field: C.sub.11 = 0.054683 β.sub.11 = 0.32272 γ.sub.11 = -38.786 δ.sub.11 = 638.12 ε.sub.11 = -10643 C.sub.12 = 0.183844 β.sub.12 = 1.39282 γ.sub.12 = 36.356 δ.sub.12 = -720.12 ε.sub.12 = 15382 ##STR1## where C.sub.i is the curvature of the ith surface, β.sub.i, γ.sub.i, δ.sub.i, and ε.sub.i (beta.sub.i, gamma.sub.i, delta.sub.i and epsilon.sub.i) are the coefficients of the aspheric polynomial terms, and ξ.sub.i (xi.sub.i) and η.sub.i (eta.sub.i) are the sagitta and zone height respectively.
Claim 3
Dependent Claim 338 words
A lens system having wide angle objectives having numerical data substantially as follows: ______________________________________ (C.F.I. = 1.0000 E.F.L. = 1.0000 f/4.983) Element Radii Thicknesses n.sub.d γ.sub.d Type ______________________________________ R.sub.1 = 0.4736 I t.sub.1 = 0.1018 1.6032 42.51 603425 R.sub.2 = 0.6391 S.sub.1 = 0.0724 R.sub.3 = 1.3925 II t.sub.2 = 0.0317 1.7885 50.45 789505 R.sub.4 = 0.3324 S.sub.2 = 0.1074 R.sub.5 = 0.4278 III t.sub.3 = 0.0819 1.8807 41.06 881411 R.sub.6 = 1.1822 S.sub.3 = 0.0493 R.sub.7 = 2.0100 IV t.sub.4 = 0.0371 1.6129 36.95 613370 R.sub.8 = 0.1704 V t.sub.5 = 0.0866 1.5567 58.54 557585 R.sub.9 = 1.0510 VI t.sub.6 = 0.0185 1.7755 37.90 776379 R.sub.10 = 1.8631 VII t.sub.7 = 0.0238 1.7847 26.10 785261 R.sub.11 = Ashp. S.sub.4 = 0.0592 R.sub.12 = Ashp. VIII t.sub.8 = 0.0238 1.7847 26.10 785261 R.sub.13 = -2.5951 IV t.sub.9 = 0.0185 1.8807 41.06 881411 R.sub.14 = -1.0510 X t.sub.10 = 0.0919 1.5567 58.54 557585 R.sub.15 = -0.1704 XI t.sub.11 = 0.0371 1.6129 36.95 613370 R.sub.16 = -2.0100 S.sub.5 = 0.0686 R.sub.17 = -1.9008 XII t.sub.12 = 0.0819 1.8807 41.06 881411 R.sub.18 = -0.4844 S.sub.6 = 0.2172 R.sub.19 = -0.3514 XIII t.sub.13 = 0.0317 1.7885 50.45 789505 R.sub.20 = -1.1862 S.sub.7 = 0.0034 R.sub.21 = -1.1378 XIV t.sub.14 = 1.64333 47.76 643478 R.sub.22 = -1.2371 S.sub.8 = 0.3374 ______________________________________ wherein the stop lies between R.sub.11 and R.sub.12 and has a clear aperture of 0.1856 at a distance along the axis of 0.0204 from R.sub.11, and surfaces 11 and 12 above are both aspheric, have coefficients taken from the equation below, and have the following shapes for a 94degree ful field: C.sub.11 = 0.073410 β.sub.11 = 0.55853 γ.sub.11 = -33.279 δ.sub.11 = -144.42 ε.sub.11 = 15586 C.sub.12 = 0.184575 β.sub.12 = 1.63547 γ.sub.12 = 28.942 δ.sub.12 = -42.037 ε.sub.12 = 1715.6 ##STR2## where C.sub.i is the curvature of the ith surface, β.sub.i, γ.sub.i, δ.sub.i, and ε.sub.i (beta.sub.i, gamma.sub.i, delta.sub.i and epsilon.sub.i) are the coefficients of the aspheric polynominal terms, and ξ.sub.i (xi.sub.i) and η.sub.i (eta.sub.i) are the sagitta and zone height respectively.
Claim 4
Dependent Claim 338 words
A lens system having wide angle objectives having numerical data substantially as follows: ______________________________________ (C.F.I. = 1.0000 E.F.L. = 1.0000 f/4.983) Element Radii Thicknesses n.sub.d γ.sub.d Type ______________________________________ R.sub.1 = 0.4736 I t.sub.1 = 0.1018 1.6032 42.51 603425 R.sub.2 = 0.6391 S.sub.1 = 0.0724 R.sub.3 = 1.3925 II t.sub.2 = 0.0317 1.7885 50.45 789505 R.sub.4 = 0.3324 S.sub.2 = 0.1074 R.sub.5 = 0.4278 III t.sub.3 = 0.0819 1.8807 41.06 881411 R.sub.6 = 1.1822 S.sub.3 = 0.0493 R.sub.7 = 2.0100 IV t.sub.4 = 0.0371 1.6129 36.95 613370 R.sub.8 = 0.1704 V t.sub.5 = 0.0866 1.5567 58.54 557585 R.sub.9 = 1.0510 VI t.sub.6 = 0.0185 1.7755 37.90 776379 R.sub.10 = 1.8631 VII t.sub.7 = 0.0238 1.7847 26.10 785261 R.sub.11 = Ashp. S.sub.4 = 0.0592 R.sub.12 = Ashp. VIII t.sub.8 = 0.0238 1.7847 26.10 785261 R.sub.13 = -2.5951 IV t.sub.9 = 0.0185 1.8807 41.06 881411 R.sub.14 = -1.0510 X t.sub.10 = 0.0919 1.5567 58.54 557585 R.sub.15 = -0.1704 XI t.sub.11 = 0.0371 1.6129 36.95 613370 R.sub.16 = -2.0100 S.sub.5 = 0.0686 R.sub.17 = -1.9008 XII t.sub.12 = 0.0819 1.8807 41.06 881411 R.sub.18 = -0.4844 S.sub.6 = 0.2172 R.sub.19 = -0.3514 XIII t.sub.13 = 0.0317 1.7885 50.45 789505 R.sub.20 = -1.1862 S.sub.7 = 0.0034 R.sub.21 = -1.1378 XIV t.sub.14 = 1.64333 47.76 643478 R.sub.22 = -1.2371 S.sub.8 = 0.3374 ______________________________________ wherein the stop lies between R.sub.11 and R.sub.12 and has a clear aperture of 0.1856 at a distance along the axis of 0.0204 from R.sub.11, and surfaces 11 and 12 above are both aspheric, have coefficients taken from the equation below, and have the following shapes for a 94degree ful field: C.sub.11 = 0.073410 β.sub.11 = 0.55853 γ.sub.11 = -33.279 δ.sub.11 = -144.42 ε.sub.11 = 15586 C.sub.12 = 0.184575 β.sub.12 = 1.63547 γ.sub.12 = 28.942 δ.sub.12 = -42.037 ε.sub.12 = 1715.6 ##STR2## where C.sub.i is the curvature of the ith surface, β.sub.i, γ.sub.i, δ.sub.i, and ε.sub.i (beta.sub.i, gamma.sub.i, delta.sub.i and epsilon.sub.i) are the coefficients of the aspheric polynominal terms, and ξ.sub.i (xi.sub.i) and η.sub.i (eta.sub.i) are the sagitta and zone height respectively.

References Cited (Backward Citations)

US2821113A Cited
US3039361A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-24 1985-11-23 1986-05-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-24 1989-11-23 1990-05-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-24 1993-11-23 1994-05-25 $7700.00 Window Closed / Lapsed

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