Patent US3609006A successfully refreshed from Google Patents.
US3609006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom projection lens system having a moveable positive component
Assignee: Meopta np
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Filing: 1969-07-08
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Granted: 1971-09-28
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Expires: 1989-07-08
Abstract
Abstract A three-member zoom projection lens system whose front member is an airspaced negative doublet, whose central element is a positive cemented doublet, and whose rear member consists of three simple lenses and a cemented doublet, the central member being axially movable between the fixed front and rear members. A lens combining an f-number of 1.2 with a ratio of maximum and minimum focal lengths of 2.4 in a projector for Super-8 motion picture film can be obtained by maintaining certain parameters in the lens design.
Inventors
- 👤 Ladislav Pospisil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:02
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/143; G02B15/1435
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
In a zoom projection lens system having fixedly spaced front and rear members, and a central member axially movable between said front and rear members, said first member being negative and said second and third members being positive, said first member consisting of a simple divergent lens element and a simple convergent lens element, the second member being a cemented doublet having a first convergent lens element and a second divergent lens element, and the third member consisting of five lens elements including three simple lens elements and one cemented doublet, the improvement which comprises: a. the exposed surface of said first lens element having a radius of curvature 1.3 to 1.7 times the radius of curvature of the exposed surface of said second lens element; b. the front surface of the divergent lens in said first member having a radius of curvature 2 to 3 times the radius of curvature of the rear surface of said divergent lens; c. the first lens of said third member being a negative, meniscus-shaped simple lens having a negatively refractive surface of a radius of curvature smaller than the radius of curvature of any exposed surface in said first and second members and at least twice the radius of curvature of the rear surface of said cemented doublet in said third member.
Claim 2
Dependent Claim
219 words
In a zoom projection lens system having fixedly spaced front and rear members, and a central member axially movable between said front and rear members, said first member being negative and said second and third members being positive, said first member consisting of a simple divergent lens element and a simple convergent lens element, the second member being a cemented doublet having a first convergent lens element and a second divergent lens element, and the third member consisting of five lens elements including three simple lens elements and one cemented doublet, the improvement which comprises: a. the exposed surface of said first lens element having a radius of curvature 1.3 to 1.7 times the radius of curvature of the exposed surface of said second lens element; b. the front surface of the divergent lens in said first member having a radius of curvature 2 to 3 times the radius of curvature of the rear surface of said divergent lens; c. the first lens of said third member being a negative, meniscus-shaped simple lens having a negatively refractive surface of a radius of curvature smaller than the radius of curvature of any exposed surface in said first and second members and at least twice the radius of curvature of the rear surface of said cemented doublet in said third member.
Claim 3
Dependent Claim
132 words
In a lens system as set forth in claim 1, said member consisting of nine lens elements having a combined total of 16 refractive surfaces, the radii of curvature of said refractive surfaces, in axial sequence front to rear, being R1 to R16, the thicknesses of said nine lens elements being d1, d3, d5, d6, d8, d10, d12, d13, d15, said nine lens elements constituting seven lenses separated by air spaces d2, d4, d7, d9, d11, d14, said radii of curvature, thicknesses, and airspaces having magnitudes, in consistent units of length, substantially as listed below, and said nine lens elements having indices of refraction nd and Abbe number Vd substantially as listed below d nd VdR1-75.131.51.6204160.3R2+26.9112.25R3+32.434.01.6727032.3 R4+ 147.20 47 to 4.2R5+65.667.01.6583257.1R6-22.0811.51.7618226.5R7- 49.052 to 44.8R8-22.0811.51.6727032.2R9- 42.0732.3R10+ 59.984.51.6260639.1R11-52.980.1 R12+ 13.1837.01.6584450.8R 13-30.0583.31.6727032.2R14+ 7.6911.1R15+ 13.1832.01.6584450.8R16+ 147.20
Claim 4
Dependent Claim
132 words
In a lens system as set forth in claim 1, said members consisting of nine lens elements having a combined total of 16 refractive surfaces, the radii of curvature of said refractive surfaces, in axial sequence front to rear, being R1 to R16, the thicknesses of said nine lens elements being d1, d3, d5, d6, d8, d10, d12, d13, d15, said nine lens elements constituting seven lenses separated by air spaces d2, d4, d7, d9, d11, d14, said radii of curvature, thicknesses, and airspaces having magnitudes, in consistent units of length, substantially as listed below, and said nine lens elements having indices of refraction nd and Abbe number Vd substantially as listed below d nd VdR1- 60.01.51.6204160.3R2+ 29.5 2.25R3+ 36.04.01.6727032.2R4+270.047 to 4.2R5+70.07.01.6204160.3R6-22.0811.51.7618226.5R7- 43.02 to 44.8R8- 20.51.11.6727032.2R9-38.6510.1R10+ 52.04.51.6260639.1R11-42.980.1R12+13.87.01.6584450.8R13 - 30.0583.81.6727032.2R14+ 7.6912.7R15+ 13.1832.11.6584450.8R16+ 147.2
Claim 5
Dependent Claim
129 words
In a lens system as set forth in claim 1, said members consisting of nine lens elements having a combined total of 16 refractive surfaces, the radii of curvature of said refractive surfaces, in axial sequence front to rear, being R1 to R16, the thicknesses of said nine lens elements being d1, d3, d5, d6, d8, d10, d12, d13, d15, said nine lens elements constituting seven lenses separated by airspaces d2, d4, d7, d9, d11, d14, said radii of curvature, thicknesses, and airspaces having magnitudes, in consistent units of length, substantially as listed below, and said nine lens elements having indices of refraction nd and Abbe number Vd substantially as listed below d nd VdR1- 75.131.51.6204160.3R2+ 26.9112.25R3+ 32.434.01.6727032.2R4+ 147.247 to 4.2R5+ 49.051.51.7618226.5R6+ 22.0817.01.6583257.1R7- 65.66to 44.8R8- 22.0811.51.6727032.2R9-38.6510.1R10+ 59.984.51.6260639.1R11-52.980.1R12+13.1837.01.6584450.8R13-30.0583.41.6727032.2R14+7.6913.1R15+ 13.1832.01.6584450.8R16+ 147.2
References Cited (Backward Citations)
US3227042A
Cited
FR1526526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |