US3603669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable focus objective
Assignee: Paillard SA
•
Filing: 1969-09-15
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Granted: 1971-09-07
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Expires: 1989-09-15
Abstract
Abstract A variable-focus objective comprises in order starting from the front, a first divergent fixed-focusing group, two movable groups, one convergent and the other divergent, said two movable groups filling the role of variator and compensator at the same time, and a fixed convergent rear group, said first group comprising at least three lenses of which the first is a convergent lens, the others being divergent, and of the following limiting ratios for the radii of curvature: WHERE F1 IS THE FOCAL DISTANCE OF THE FOCUSING GROUP. The first fixed group may include 3 or 4 lenses of which one is convergent and the others divergent. The focusing distance is 2f1 to 3f1 and the zoom ratio is about 5.
Inventors
- 👤 Kow-Fat Lai
- 👤 Christian Lietar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:29
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A variable focus objective lens comprising, in order starting from the front; a first divergent fixed-focusing group of lenses, said group including at least three lenses, the first lens of said group being convergent and the other lenses of the group being divergent, said first lens having a rear meniscus spaced from the forward meniscus of the next adjacent lens of said group; two movable groups, one convergent and the other divergent, said two movable groups filling the roll of variator and compensator at the same time; a fixed convergent rear group; said objective lens having the following numerical data:
Claim 2
Dependent Claim
100 words
A variable focus objective lens comprising, in order starting from the front; a first divergent fixed-focusing group of lenses, said group including at least three lenses, the first lens of said group being convergent and the other lenses of the group being divergent, said first lens having a rear meniscus spaced from the forward meniscus of the next adjacent lens of said group; two movable groups, one convergent and the other divergent, said two movable groups filling the roll of variator and compensator at the same time; a fixed convergent rear group; said objective lens having the following numerical data:
Claim 3
Dependent Claim
13 words
An objective according to claim 1 having a zoom ratio of about 5.
Claim 4
Dependent Claim
18 words
An objective according to claim 1, wherein the focusing distance is of the order of 2f1 to 3f1.
Claim 5
Dependent Claim
100 words
A variable focus objective lens comprising, in order starting from the front; a first divergent fixed-focusing group of lenses, said group including at least three lenses, the first lens of said group being convergent and the other lenses of the group being divergent, said first lens having a rear meniscus spaced from the forward meniscus of the next adjacent lens of said group; two movable groups, one convergent and the other divergent, said two movable groups filling the role of variator and compensator at the same time; a fixed convergent rear group; said objective lens having the following numerical data:
Claim 6
Dependent Claim
100 words
A variable focus objective lens comprising, in order starting from the front; a first divergent fixed-focusing group of lenses, said group including at least three lenses, the first lens of said group being convergent and the other lenses of the group being divergent, said first lens having a rear meniscus spaced from the forward meniscus of the next adjacent lens of said group; two movable groups, one convergent and the other divergent, said two movable groups filling the role of variator and compensator at the same time; a fixed convergent rear group; said objective lens having the following numerical data:
Claim 7
Dependent Claim
18 words
An objective according to claim 4, wherein the focusing distance is of the order of 2f1 to 3f1.
Claim 8
Dependent Claim
13 words
An objective according to claim 4, having a zoom ratio of about 5.
References Cited (Backward Citations)
US3152211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |