US3936154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short focal length large aperture optical system
Assignee: Bell and Howell Co
•
Filing: 1974-11-11
•
Granted: 1976-02-03
•
Expires: 1994-11-11
Abstract
Abstract This invention relates to a short focal length, large aperture optical system primarily designed to efficiently transmit light rays to an image plane with an extraordinarily high degree of correction over a prescribed field.
Inventors
- 👤 Andor A. Fleischmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:21
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
An optical system of relatively short focal length and large aperture having substantially the following specification: EFL = 7.58mm
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 =- .3000
D.sub.1 = .0500
R.sub.2 = .4561
S.sub.1 = .6391
L.sub.2
*R.sub.3 =-18.01123
D.sub.2 = .0993
[R.sub.3 = A(1)]
R.sub.4 = .7530
S.sub.2 = .0500
L.sub.3
R.sub.5 = .6069
D.sub.3 = .1073
R.sub.6 = 6.5060
S.sub.3 = .0070
L.sub.4
*R.sub.7 = .23131
D.sub.4 = .2923
[R.sub.7 = A(2)]
[R.sub.8 =- .6121]
R.sub.8 =- .2161
S.sub. 4 = .1450 BFL
______________________________________
ALL ELEMENTS: V=57.4, N.sub.D =1.4917 wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the same dispersive index and refractive index; the second column lists the respective base radii and the vertex radii of the aspheric surfaces *R 3 and *R 7 ; the negative (-) values of the radii indicate surfaces which are concave; the third column lists the thickness D 1 to D 4 of the respective elements; and the fourth column lists the axial spacings S 1 to S 4 between the respective elements, and the image plane.
Claim 2
Dependent Claim
200 words
An optical system of relatively short focal length and large aperture having substantially the following specification: EFL = 7.58mm
1/2 Angle of Field = 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 =- .3000
D.sub.1 = .0500
R.sub.2 = .4561
S.sub.1 = .6391
L.sub.2
*R.sub.3 =-18.01123
D.sub.2 = .0993
[R.sub.3 = A(1)]
R.sub.4 = .7530
S.sub.2 = .0500
L.sub.3
R.sub.5 = .6069
D.sub.3 = .1073
R.sub.6 = 6.5060
S.sub.3 = .0070
L.sub.4
*R.sub.7 = .23131
D.sub.4 = .2923
[R.sub.7 = A(2)]
[R.sub.8 =- .6121]
R.sub.8 =- .2161
S.sub. 4 = .1450 BFL
______________________________________
ALL ELEMENTS: V=57.4, N.sub.D =1.4917 wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the same dispersive index and refractive index; the second column lists the respective base radii and the vertex radii of the aspheric surfaces *R 3 and *R 7 ; the negative (-) values of the radii indicate surfaces which are concave; the third column lists the thickness D 1 to D 4 of the respective elements; and the fourth column lists the axial spacings S 1 to S 4 between the respective elements, and the image plane.
Claim 3
Dependent Claim
185 words
An optical system of relatively short focal length and large aperture having substantially the following specification: EFL = 7.61mm (.2995 inches)
1/2 Angle of Field 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 =- .2116
D.sub.1 = .0747
R.sub.2 = .2472
S.sub.1 = .6402
L.sub.2
*R.sub.3 = .54167
D.sub.2 = .1241
[R.sub.3 = A(1)]
R.sub.4 = 1.1632
S.sub.2 = .0249
L.sub.3
*R.sub.5 = .23512
D.sub.3 = .2579
[R.sub.5 = A(2)]
R.sub.6 =- .6838 S.sub.3 = .1449 BFL
______________________________________
ALL ELEMENTS: V=57.4, N.sub.D =1.4917 wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the same dispersive index and refractive index; the second column lists the respective base radii and the vertex radii of the aspheric surfaces *R 3 and *R 5 ; the negative (-) values of the radii indicate surfaces which are concave; the third column lists the thickness D 1 to D 3 of the respective elements; and the fourth column lists the axial spacings S 1 to S 3 between the respective elements, and the image plane.
Claim 4
Dependent Claim
185 words
An optical system of relatively short focal length and large aperture having substantially the following specification: EFL = 7.61mm (.2995 inches)
1/2 Angle of Field 2.58°
LENS RADII (IN.) THICKNESS (IN.)
SPACING (IN.)
______________________________________
L.sub.1
R.sub.1 =- .2116
D.sub.1 = .0747
R.sub.2 = .2472
S.sub.1 = .6402
L.sub.2
*R.sub.3 = .54167
D.sub.2 = .1241
[R.sub.3 = A(1)]
R.sub.4 = 1.1632
S.sub.2 = .0249
L.sub.3
*R.sub.5 = .23512
D.sub.3 = .2579
[R.sub.5 = A(2)]
R.sub.6 =- .6838 S.sub.3 = .1449 BFL
______________________________________
ALL ELEMENTS: V=57.4, N.sub.D =1.4917 wherein the first column lists the lens elements numerically starting at the ray entrance side of the system which elements each have the same dispersive index and refractive index; the second column lists the respective base radii and the vertex radii of the aspheric surfaces *R 3 and *R 5 ; the negative (-) values of the radii indicate surfaces which are concave; the third column lists the thickness D 1 to D 3 of the respective elements; and the fourth column lists the axial spacings S 1 to S 3 between the respective elements, and the image plane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |