US3871748A
Expired / Lapsed
US
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Anamorphotic optical objective
Assignee: Rank Organization Ltd
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Filing: 1973-03-29
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Granted: 1975-03-18
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Expires: 1993-03-29
Abstract
Abstract An anamorphotic optical system comprising a spherical lens unit and two cylindrical lens units, one in front of the spherical lens unit and one behind it, the two cylindrical lens units being individually parfocal between their cylindrically active and cylindrically passive planes with respect to the object plane and the focal plane of the spherical lens unit.
Inventors
- 👤 David John Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
An anamorphotic objective system comprising a spherical lens unit and two cylindrical lens groups constituted by one cylindrical lens group in front of the spherical lens unit and one cylindrical lens group to the rear of the spherical lens unit, wherein each cylindrical lens group comprises a pair of cylindrical lenses, one convergent and one divergent, and the cylindrical lens groups are individually parfocal between their cylindrically active and cylindrically passive planes with respect to the object plane and the focal plane of the spherical lEns unit, the cylindrical lenses in each group being relatively movable in the axial direction to maintain equality of focus between the cylindrically active and cylindrically passive planes during variation of the anamorphotic effect.
Claim 2
Dependent Claim
119 words
An anamorphotic objective system comprising a spherical lens unit and two cylindrical lens groups constituted by one cylindrical lens group in front of the spherical lens unit and one cylindrical lens group to the rear of the spherical lens unit, wherein each cylindrical lens group comprises a pair of cylindrical lenses, one convergent and one divergent, and the cylindrical lens groups are individually parfocal between their cylindrically active and cylindrically passive planes with respect to the object plane and the focal plane of the spherical lEns unit, the cylindrical lenses in each group being relatively movable in the axial direction to maintain equality of focus between the cylindrically active and cylindrically passive planes during variation of the anamorphotic effect.
Claim 3
Dependent Claim
18 words
A system according to claim 1, wherein each cylindrical lens has one cylindrical surface and one planar surface.
Claim 4
Dependent Claim
66 words
A system according to claim 1, wherein the axial thicknesses of the cylindrical lens of each unit, in conjunction with the mean refractive indices and Abbe V numbers os these lenses, are chosen to minimise aberrations arising in the cylindrical lens groups, while the spherical lens unit is designed with a departure from flat field correction to compensate for aberration residuals of the cylindrical lens groups.
Claim 5
Dependent Claim
115 words
An anamorphotic objective system comprising a spherical lens unit and two cylindrical lens groups constituted by one cylindrical lens group in front of the spherical lens unit and one cylindrical lens group to the rear of the spherical lens unit, said cylindrical lens group being relatively rotatable to vary the anamorphotic effect, wherein the cylindrical lens groups are individually parfocal between their cylindrically active and cylindrically passive planes with respect to the object plane and the focal plane of the spherical lens unit, the cylindrical lenses in each group being relatively movable in the axial direction to maintain equality of focus between the cylindrically active and cylindrically passive planes during variation of the anamorphotic effect.
Claim 6
Dependent Claim
115 words
An anamorphotic objective system comprising a spherical lens unit and two cylindrical lens groups constituted by one cylindrical lens group in front of the spherical lens unit and one cylindrical lens group to the rear of the spherical lens unit, said cylindrical lens group being relatively rotatable to vary the anamorphotic effect, wherein the cylindrical lens groups are individually parfocal between their cylindrically active and cylindrically passive planes with respect to the object plane and the focal plane of the spherical lens unit, the cylindrical lenses in each group being relatively movable in the axial direction to maintain equality of focus between the cylindrically active and cylindrically passive planes during variation of the anamorphotic effect.
Claim 7
Dependent Claim
32 words
A system according to claim 4, wherein the anamorphotic effect is continuously variable by equal rotations of the cylindrical groups in opposite senses about the optical axis of the spherical lens unit.
Claim 8
Dependent Claim
38 words
A system according to claim 5, wherein the axial position of the complete system is variable relative to the object plane in order to maintain unchanged magnification in the cylindrically passive plane during variation of the anamorphotic effect.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |