US4002407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Objective
Assignee: Olympus Corp
•
Filing: 1975-12-04
•
Granted: 1977-01-11
•
Expires: 1995-12-04
Abstract
Abstract A light-weight objective which comprises a small number of lens components, i.e., a first positive lens component, a second positive lens component and a third positive cemented lens component and can be manufactured at low cost, and wherein aberrations are favorably corrected at a wavelength of 6328 A.
Inventors
- 👤 Haruo Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
An objective comprising a first positive lens component, a second positive lens component and a third positive cemented doublet lens component, and said objective having the following numerical data: ______________________________________
f = 1.0, NA = 0.35, WD = 0.164, β = 13.5x
r.sub.1 = ∞
d.sub.1 = 0.4861
n.sub.1 = 1.51633
ν.sub.1 = 64.1
r.sub.2 = -0.5612
d.sub.2 = 0.4111
r.sub.3 = ∞
d.sub.3 = 0.3897
n.sub.2 = 1.51633
ν.sub.2 = 64.1
r.sub.4 = -1.3446
d.sub.4 = 0.3592
r.sub.5 = 2.3324
d.sub.5 = 0.2109
n.sub.3 = 1.74077
ν.sub.3 = 27.8
r.sub.6 = 0.8853
d.sub.6 = 0.3782
n.sub.4 = 1.51633
ν.sub.4 = 64.1
r.sub.7 = -2.1008
______________________________________ wherein the reference symbols r 1 through r 7 represent radii of curvature on the surfaces of the lens components, the reference symbols d 1 through d 6 denote thicknesses of the lens elements and air spaces, reference symbols n 1 through n 4 designate refractive indices of the lens elements and reference symbols ν 1 through ν 4 represent Abbe's numbers of the lens components.
Claim 2
Dependent Claim
172 words
An objective comprising a first positive lens component, a second positive lens component and a third positive cemented doublet lens component, and said objective having the following numerical data: ______________________________________
f = 1.0, NA = 0.35, WD = 0.164, β = 13.5x
r.sub.1 = ∞
d.sub.1 = 0.4861
n.sub.1 = 1.51633
ν.sub.1 = 64.1
r.sub.2 = -0.5612
d.sub.2 = 0.4111
r.sub.3 = ∞
d.sub.3 = 0.3897
n.sub.2 = 1.51633
ν.sub.2 = 64.1
r.sub.4 = -1.3446
d.sub.4 = 0.3592
r.sub.5 = 2.3324
d.sub.5 = 0.2109
n.sub.3 = 1.74077
ν.sub.3 = 27.8
r.sub.6 = 0.8853
d.sub.6 = 0.3782
n.sub.4 = 1.51633
ν.sub.4 = 64.1
r.sub.7 = -2.1008
______________________________________ wherein the reference symbols r 1 through r 7 represent radii of curvature on the surfaces of the lens components, the reference symbols d 1 through d 6 denote thicknesses of the lens elements and air spaces, reference symbols n 1 through n 4 designate refractive indices of the lens elements and reference symbols ν 1 through ν 4 represent Abbe's numbers of the lens components.
References Cited (Backward Citations)
US2781694A
Cited
US3476462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |