US3586418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-angle eyepiece lens system
Assignee: Minolta Co Ltd
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Filing: 1969-03-17
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Granted: 1971-06-22
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Expires: 1989-03-17
Abstract
Abstract A highly corrected wide-angle eyepiece lens system includes first, third and fifth positive and second, fourth and sixth negative lens elements the first two elements forming a cemented positive composite lens with a concave rear and convex front face and the third and fourth elements forming cemented positive lens with a convex rear face, the fifth element rear face and the sixth element front face being concentric with a point on the image side. The lens system possesses the following relationship: r9 r12 + d9-12 1.5f r5 r4 2.25f WHEREIN RN IS THE RADIUS OF CURVATURE OF THE SUBSCRIPT DESIGNATED LENS FACE; D9-12 IS THE AXIAL DISTANCE BETWEEN THE NINTH AND 12TH LENS FACES AND F IS THE FOCAL LENGTH OF THE LENS SYSTEM.
Inventors
- 👤 Haruo Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:57
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/001
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A wide angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first third and fifth lens elements being positive and the second, fourth and sixth lens elements being negative, the second, fourth, fifth, sixth and ninth lens faces being convex, the third, seventh and twelfth lens faces being concave, the first lens face having a longer radius of curvature than the fourth lens face, the eighth lens face having a longer radius of curvature than the fifth lens face, the tenth lens face having a longer radius of curvature than the ninth lens face, the eleventh lens face having a longer radius of curvature than the twelfth lens face, the first and second lens elements being cemented at their confronting faces to form a first positive doubleT lens, the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, and the ninth and twelfth faces being substantially concentric.
Claim 2
Dependent Claim
183 words
A wide angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first third and fifth lens elements being positive and the second, fourth and sixth lens elements being negative, the second, fourth, fifth, sixth and ninth lens faces being convex, the third, seventh and twelfth lens faces being concave, the first lens face having a longer radius of curvature than the fourth lens face, the eighth lens face having a longer radius of curvature than the fifth lens face, the tenth lens face having a longer radius of curvature than the ninth lens face, the eleventh lens face having a longer radius of curvature than the twelfth lens face, the first and second lens elements being cemented at their confronting faces to form a first positive doubleT lens, the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, and the ninth and twelfth faces being substantially concentric.
Claim 3
Dependent Claim
13 words
The lens system of claim 1 wherein said first lens face is concave.
Claim 4
Dependent Claim
19 words
The lens system of claim 1 wherein said fifth and sixth lens elements are separated by an air space.
Claim 5
Dependent Claim
16 words
The lens system of claim 1 wherein said fifth and sixth lens elements are cemented together.
Claim 6
Dependent Claim
85 words
A wide angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first and second lens elements being cemented at their confronting faces to form a first positive doublet lens and the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, said lens system possessing the following dimensions and relationships:
Claim 7
Dependent Claim
85 words
A wide angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first and second lens elements being cemented at their confronting faces to form a first positive doublet lens and the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, said lens system possessing the following dimensions and relationships:
Claim 8
Dependent Claim
84 words
A wide-angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first and second lens elements being cemented at their confronting faces to form a first positive doublet lens and the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, said lens system possessing the following dimensions and relationships:
Claim 9
Dependent Claim
84 words
A wide-angle eyepiece lens system comprising six lens elements successively designated from the pupil side as the first to the sixth and having faces successively designated from the pupil side as the first to the twelfth the first and second lens elements being cemented at their confronting faces to form a first positive doublet lens and the third and fourth lens elements being cemented at their confronting faces to form a second positive doublet lens, said lens system possessing the following dimensions and relationships:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |