US3832035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle, retrofocus-type photo-taking lens
Assignee: Nikon Corp
•
Filing: 1972-08-21
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Granted: 1974-08-27
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Expires: 1992-08-21
Abstract
Abstract A wide angle, substantially distortion-free inverted telephototype photo-taking lens system comprises a forward divergent group, a forward convergent group preceding a diaphragm, and a rearward convergent group succeeding the diaphragm. Any one surface in the forward divergent group may be a non-spherical surface whose non-sphericity is within a predetermined range. The lens system satisfies a predetermined condition of the center thicknesses of lenses or the air spaces between lenses.
Inventors
- 👤 T Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:37
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
In a wide angle, substantially distortion free, inverted telephoto lens system consisting of a front diverging lens group and a rear converging lens group, said front diverging lens group comprising at least two negative single meniscus lenses and a positive single meniscus lens disposed between said negative meniscus lenses, said rear converging lens group comprising a positive cemented compound lens, a negative meniscus single lens, two positive lenses having a stop disposed therebetween, a negative biconcave lens, and two positive lenses, the improvement which comprises at least one concave surface of said front divergent lens group in the direction toward the stop being nonspHerical for correcting distortion while some of the lenses are of a thickness to provide optical paths of a length to eliminate astigmatism.
Claim 2
Dependent Claim
126 words
In a wide angle, substantially distortion free, inverted telephoto lens system consisting of a front diverging lens group and a rear converging lens group, said front diverging lens group comprising at least two negative single meniscus lenses and a positive single meniscus lens disposed between said negative meniscus lenses, said rear converging lens group comprising a positive cemented compound lens, a negative meniscus single lens, two positive lenses having a stop disposed therebetween, a negative biconcave lens, and two positive lenses, the improvement which comprises at least one concave surface of said front divergent lens group in the direction toward the stop being nonspHerical for correcting distortion while some of the lenses are of a thickness to provide optical paths of a length to eliminate astigmatism.
Claim 3
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.962mm
Claim 4
Dependent Claim
32 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back Focus B.F. 41.904mm
Claim 5
Dependent Claim
32 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back Focus B.F. 42.255mm
Claim 6
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.895mm
Claim 7
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-focus B.F. 39.497mm
Claim 8
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm RelaTive aperture F/3.5 Angle of view 100* Back-focus B.F. 37.904mm
Claim 9
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.878mm
Claim 10
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 42.136mm
Claim 11
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.834mm
Claim 12
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4.0 Angle of view 100* Back-Focus B.F. 37.986mm
Claim 13
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 36.924mm
Claim 14
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 37.672mm
Claim 15
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 38.622mm
Claim 16
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-focus B.F. 38.24mm
Claim 17
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-Focus B.F. 38.33mm
Claim 18
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-Focus B.F. 38.058mm
Claim 19
Dependent Claim
31 words
A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/5.6 Angle of view 100* Back-Focus B.F. 39.805mm
References Cited (Backward Citations)
US3037426A
Cited
US3572901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |