US3944338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short focal length long back focus objective
Assignee: Bell and Howell Co
•
Filing: 1974-11-11
•
Granted: 1976-03-16
•
Expires: 1994-11-11
Abstract
Abstract This invention relates to a short focal length, large aperture optical system having a relatively long back focus primarily designed to efficiently transmit monochromatic light rays to an image plane with an extraordinarily high degree of correction over a prescribed field.
Inventors
- 👤 Andor A. Fleischman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:22
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12; G02B9/14; G02B9/18; G02B9/20; G02B13/00; G02B13/24; G02B9/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
An optical system of relatively short focal length and large aperture having a relatively long back focus and substantially the following specification: EFL = 8.17mm(.3215 inch)
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 = .8800
D.sub.1 = .0750
R.sub.2 = 15.4000
S.sub.1 = .0350
L.sub.2
R.sub.3 = -.3370
D.sub.2 = .2230
R.sub.4 = .4120
S.sub.2 = .3100
L.sub.3
R.sub.5 = .4310
D.sub.3 = .0960
R.sub.6 = -6.6720
S.sub.3 = .0040
L.sub.4
R.sub.7 = .1750
D.sub.4 = .0940
R.sub.8 = -.2450
S.sub.4 = .1000
(.1545 BFL)
L.sub.5
R.sub.9 = Inf.
D.sub.5 = .0492
R.sub.10 = Inf.
0 ≦ S.sub.5 ≦ .0053
For ELEMENTS L.sub.1, L.sub.3 V = 25.4 N.sub.D = 1.805
For ELEMENTS L.sub.2, L.sub.4 V = 66.1 N.sub.D = 1.494
ELEMENT L.sub.5 -- OPTICAL MATERIAL
______________________________________ wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the dispersive index V and the refractive index N D ; the second column lists the respective base radii R 1 to R 10 ; the third column lists the thickness D 1 to D 5 of the respective elements; and the fourth column lists the axial spacings S 1 to S 5 between the respective elements, and the image plane.
Claim 2
Dependent Claim
218 words
An optical system of relatively short focal length and large aperture having a relatively long back focus and substantially the following specification: EFL = 8.17mm(.3215 inch)
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 = .8800
D.sub.1 = .0750
R.sub.2 = 15.4000
S.sub.1 = .0350
L.sub.2
R.sub.3 = -.3370
D.sub.2 = .2230
R.sub.4 = .4120
S.sub.2 = .3100
L.sub.3
R.sub.5 = .4310
D.sub.3 = .0960
R.sub.6 = -6.6720
S.sub.3 = .0040
L.sub.4
R.sub.7 = .1750
D.sub.4 = .0940
R.sub.8 = -.2450
S.sub.4 = .1000
(.1545 BFL)
L.sub.5
R.sub.9 = Inf.
D.sub.5 = .0492
R.sub.10 = Inf.
0 ≦ S.sub.5 ≦ .0053
For ELEMENTS L.sub.1, L.sub.3 V = 25.4 N.sub.D = 1.805
For ELEMENTS L.sub.2, L.sub.4 V = 66.1 N.sub.D = 1.494
ELEMENT L.sub.5 -- OPTICAL MATERIAL
______________________________________ wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the dispersive index V and the refractive index N D ; the second column lists the respective base radii R 1 to R 10 ; the third column lists the thickness D 1 to D 5 of the respective elements; and the fourth column lists the axial spacings S 1 to S 5 between the respective elements, and the image plane.
Claim 3
Dependent Claim
217 words
An optical system of relatively short focal length and large aperture having a relatively long back focus and substantially the following specification: EFL = 8.17mm
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 = .8800
D.sub.1 = .0810
R.sub.2 = 15.4000
S.sub.1 = .350
L.sub.2
R.sub.3 = -.3370
D.sub.2 = .2250
R.sub.4 = .4120
S.sub.2 = .3110
L.sub.3
R.sub.5 = .4310
D.sub.3 = .0880
R.sub.6 = -6.6720
S.sub.3 = .0040
L.sub.4
R.sub.7 = .1715
D.sub.4 = .0970
R.sub.8 = -.2450
S.sub.4 = .1000
(.1535 BFL)
L.sub.5
R.sub.9 = Inf.
D.sub.5 = .0492
R.sub.10 = Inf.
0 ≦ S.sub.5 ≦ .1044
For ELEMENTS L.sub.1, L.sub.3 V = 25.4 N.sub.D = 1.805
For ELEMENTS L.sub.2, L.sub.4 V = 57.4 N.sub.D = 1.490
ELEMENT L.sub.5 -- OPTICAL MATERIAL
______________________________________ wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the dispersive index V and the refractive index N D ; the second column lists the respective base radii R 1 to R 10 ; the third column lists the thickness D 1 to D 5 of the respective elements; and the fourth column lists the axial spacings S 1 to S 5 between the respective elements, and the image plane.
Claim 4
Dependent Claim
217 words
An optical system of relatively short focal length and large aperture having a relatively long back focus and substantially the following specification: EFL = 8.17mm
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 = .8800
D.sub.1 = .0810
R.sub.2 = 15.4000
S.sub.1 = .350
L.sub.2
R.sub.3 = -.3370
D.sub.2 = .2250
R.sub.4 = .4120
S.sub.2 = .3110
L.sub.3
R.sub.5 = .4310
D.sub.3 = .0880
R.sub.6 = -6.6720
S.sub.3 = .0040
L.sub.4
R.sub.7 = .1715
D.sub.4 = .0970
R.sub.8 = -.2450
S.sub.4 = .1000
(.1535 BFL)
L.sub.5
R.sub.9 = Inf.
D.sub.5 = .0492
R.sub.10 = Inf.
0 ≦ S.sub.5 ≦ .1044
For ELEMENTS L.sub.1, L.sub.3 V = 25.4 N.sub.D = 1.805
For ELEMENTS L.sub.2, L.sub.4 V = 57.4 N.sub.D = 1.490
ELEMENT L.sub.5 -- OPTICAL MATERIAL
______________________________________ wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the dispersive index V and the refractive index N D ; the second column lists the respective base radii R 1 to R 10 ; the third column lists the thickness D 1 to D 5 of the respective elements; and the fourth column lists the axial spacings S 1 to S 5 between the respective elements, and the image plane.
References Cited (Backward Citations)
US3450463A
Cited
US3612661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |