Patent US3784286A successfully refreshed from Google Patents.
US3784286A
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US
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Wide-angle objective lens
Assignee: Individual
•
Filing: 1972-05-08
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Granted: 1974-01-08
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Expires: 1992-05-08
Abstract
Abstract A wide-angle objective lens which provides good definition over a field of more than 120* at an aperture greater than 1/3.5, with a diaphragm placed outside the lens, the outer lenses being made of glass and the inner ones of plastic and protected from scratching. These lenses can be produced by moulding, polymerization or shaping. Their surfaces can be aspheric. The lens power of the inner lenses is O when they are spherical. The choice of curves for the lenses allows a higher degree of correction.
Inventors
- 👤 R Dudragne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:46
CPC Classifications
G; G02; G02B; G02B23/00; A; A61; A61B; A61B3/00; A61B3/0008; A61B3/10; A61B3/12; A61B3/125; G02B23/24; G02B23/2407; G02B23/2423; G02B23/243; G02B23/2461; G02B23/2469; G02B6/00; G02B6/04; G02B6/06; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A wide-angle objective lens system with a large aperture, said objective having a substantially plane diaphragm placed outside the lens system, the angular field being at least 80* for an aperture of at least 1/3.5, said system comprising, disposed along a common optical axis in succession behind the diaphragm, first and second groups of lenses, on opposite sides of a correcting component, said first group comprising at least first, second and third lenses, the first and second lenses being divergent whereas the third lens is convergent, and the second group being a doublet comprising a convergent lens and a divergent lens.
Claim 2
Dependent Claim
101 words
A wide-angle objective lens system with a large aperture, said objective having a substantially plane diaphragm placed outside the lens system, the angular field being at least 80* for an aperture of at least 1/3.5, said system comprising, disposed along a common optical axis in succession behind the diaphragm, first and second groups of lenses, on opposite sides of a correcting component, said first group comprising at least first, second and third lenses, the first and second lenses being divergent whereas the third lens is convergent, and the second group being a doublet comprising a convergent lens and a divergent lens.
Claim 3
Dependent Claim
30 words
A wide-angle objective lens system as claimed in claim 1, wherein said correcting component comprises a convergent lens having an aspheric rear surface with a concavity oriented tOwards the diaphragm.
Claim 4
Dependent Claim
50 words
The wide-angle objective lens system as claimed in claim 1, wherein the front and rear surfaces of said first lens, at least the front surface of said second lens and at least the rear surface of said third lens of said first group, have a concavity oriented towards said diaphragm.
Claim 5
Dependent Claim
41 words
The wide-angle objective lens system as claimed in claim 3, wherein the front surface of said convergent lens of said second group and the rear surface of said divergent lens of said second group have a convexity oriented towards said diaphragm.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |