US4750820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens having magnification factors in the range of 20X to 47X for micrographic applications
Assignee: 3M Co
•
Filing: 1987-04-01
•
Granted: 1988-06-14
•
Expires: 2007-04-01
Abstract
Abstract A zoom lens system having magnification factors in the range of 20 to 47. The lens system of the present invention is particularly useful in micrographic reader/printers.
Inventors
- 👤 Gerhardt H. Pareigat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:35
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B15/00; G02B15/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A variable focal length lens systems for use in micrographic projectors and printers comprising lenses according to the following Table: ______________________________________
RADIUS
OF
SURFACE CURVATURE THICKNESS SEPARATION
______________________________________
S1 29.315
1.20
S2 12.368
5.34
S3 -35.608
1.20
S4 90.415
0.10
S5 26.883
2.10
S6 347.656
1.000-
24.064
S7 n/a
1.00
S8 50.004
2.55
S9 -58.981
0.10
S10 19.467
7.02
S11 -26.243
8.42
S12 14.005
5.40
S13 44.992
2.20
S14 -45.909
______________________________________
INDEX
TOLER- OF DECEN-
SURFACE ANCE REFRACTION TRATION TILT
______________________________________
S1
0.10 1.74950 0.015 0.056
S2
0.025
S3
0.05 1.74100 0.020 0.055
S4
0.020
S5
0.05 1.84666 0.015 0.045
S6
S7
0.10
S8
0.10 1.83400 0.015 0.036
S9
0.04
S10
0.05 1.60729 0.010 0.037
S11
0.05 1.80518 0.010 0.043
S12
0.03
S13
0.05 1.80420 0.020 0.050
S14
______________________________________
Claim 2
Dependent Claim
129 words
A variable focal length lens systems for use in micrographic projectors and printers comprising lenses according to the following Table: ______________________________________
RADIUS
OF
SURFACE CURVATURE THICKNESS SEPARATION
______________________________________
S1 29.315
1.20
S2 12.368
5.34
S3 -35.608
1.20
S4 90.415
0.10
S5 26.883
2.10
S6 347.656
1.000-
24.064
S7 n/a
1.00
S8 50.004
2.55
S9 -58.981
0.10
S10 19.467
7.02
S11 -26.243
8.42
S12 14.005
5.40
S13 44.992
2.20
S14 -45.909
______________________________________
INDEX
TOLER- OF DECEN-
SURFACE ANCE REFRACTION TRATION TILT
______________________________________
S1
0.10 1.74950 0.015 0.056
S2
0.025
S3
0.05 1.74100 0.020 0.055
S4
0.020
S5
0.05 1.84666 0.015 0.045
S6
S7
0.10
S8
0.10 1.83400 0.015 0.036
S9
0.04
S10
0.05 1.60729 0.010 0.037
S11
0.05 1.80518 0.010 0.043
S12
0.03
S13
0.05 1.80420 0.020 0.050
S14
______________________________________
Claim 3
Dependent Claim
18 words
The lens system of claim 1 further comprising a prism for rotating images produced by said lens system.
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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |