US4733951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens having magnification factors in the range of 6.5x to 14x for micrographic applications
Assignee: 3M Co
•
Filing: 1987-04-01
•
Granted: 1988-03-29
•
Expires: 2007-04-01
Abstract
Abstract A zoom lens system having magnification factors in the range of 6.5 to 14. The lens system of the invention is particularly useful in micrographic reader/printers.
Inventors
- 👤 Gerhardt H. Pareigat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:08
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B15/00; G02B15/14; G02B15/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
A variable focal length lens systems for use in micrographic projectors and printers comprising lenses according to the following Table: ______________________________________
RADIUS
ELE- OF THICK-
MENT SURFACE CURVATURE NESS SEPARATION
______________________________________
S1 19.146
12 7.60
S2 -21.208
14 1.50
S3 28.652
16.75
S4 -216.043
16 6.80
S5 -13.501
18 2.00
S6 -33.758
0.20
S7 27.871
20 4.90
S8 -354.527
4.075
-17.336
S9 -65.515
22 2.30
S10 28.767
24 4.48
S11 -312.853
2.30
S12 -29.315
26 2.50
S13 Plano
______________________________________
INDEX
ELE- OF DECEN-
MENT TOLERANCE REFRACTION TRATION TILT
______________________________________
12 0.050 1.69350 0.012 0.046
14 0.050 1.78590
0.050
16 0.100 1.48749 0.012 0.086
18 0.100 1.83500
0.050
20 0.100 1.48749 0.025 0.070
22 0.100 1.77250 0.035 0.059
24 0.100 1.78470
0.050
26 0.100 1.64000 0.025 0.054
______________________________________ wherein the radius of curvature is expressed as positive for surfaces convex to the direction of light and negative for surfaces concave to the direction of light, the radii, thickness, separation, tolerances for the thicknesses of the elements and decentration are expressed in millimeters and tilt is expressed in degrees.
Claim 2
Dependent Claim
177 words
A variable focal length lens systems for use in micrographic projectors and printers comprising lenses according to the following Table: ______________________________________
RADIUS
ELE- OF THICK-
MENT SURFACE CURVATURE NESS SEPARATION
______________________________________
S1 19.146
12 7.60
S2 -21.208
14 1.50
S3 28.652
16.75
S4 -216.043
16 6.80
S5 -13.501
18 2.00
S6 -33.758
0.20
S7 27.871
20 4.90
S8 -354.527
4.075
-17.336
S9 -65.515
22 2.30
S10 28.767
24 4.48
S11 -312.853
2.30
S12 -29.315
26 2.50
S13 Plano
______________________________________
INDEX
ELE- OF DECEN-
MENT TOLERANCE REFRACTION TRATION TILT
______________________________________
12 0.050 1.69350 0.012 0.046
14 0.050 1.78590
0.050
16 0.100 1.48749 0.012 0.086
18 0.100 1.83500
0.050
20 0.100 1.48749 0.025 0.070
22 0.100 1.77250 0.035 0.059
24 0.100 1.78470
0.050
26 0.100 1.64000 0.025 0.054
______________________________________ wherein the radius of curvature is expressed as positive for surfaces convex to the direction of light and negative for surfaces concave to the direction of light, the radii, thickness, separation, tolerances for the thicknesses of the elements and decentration are expressed in millimeters and tilt is expressed in degrees.
Claim 3
Dependent Claim
18 words
The lens system of claim 1 further comprising a prism for rotating images produced by said lens system.
Claim 4
Dependent Claim
41 words
The lens system as described in claim 1 wherein said elements 12 and 14 are movable with elements 16, 18 and 20 and elements 22, 24 and 26 are movable with respect to the film plane and lenses 12 to 20.
Claim 5
Dependent Claim
56 words
The lens system of claim 1 wherein the magnifications are from 6.5× to 14× and is usable with microfilm of 35 mm and 16 mm as well as microfiche and the lens system benefits the user in that the choice of magnification affords exposure of the photoconductive surface to reduce toner consumption in a plain-paper machine.
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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |