US3784290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defocusing device for optical systems
Assignee: Jos Schneider Optische Werke GmbH
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Filing: 1972-05-24
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Granted: 1974-01-08
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Expires: 1992-05-24
Abstract
Abstract To produce a totally blurred image in the dissolution of a moving-picture scene, a camera objective of the varifocal type is provided with an iris diaphragm whose leaves consist of lightscattering translucent material.
Inventors
- 👤 J Strobel
- 👤 N Beisiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:49
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/20; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
In a camera objective having rear lens means and front lens means spaced apart along an optical axis, the combination therewith of a blurring diaphragm with a mounting ring centered on said axis and interposed between said front and rear leans means, said blurring diaphragm having a circular array of iris leaves of light-scattering translucent material pivotally mounted on said ring and symmetrically movable toward said axis for defocusing an image projected by said front and rear leans means; an iris diaphragm with opaque leaves aligned with said blurring diaphragm and disposed between said front and rear lens means beyond said blurring diaphragm as seen in the direction of incident light; sensing means responsive to the light intensity between said diaphragms; and control means for said iris diaphragm responsive to said sensing means for opening said iris diaphragm upon closure of said blurring diaphragm.
Claim 2
Dependent Claim
144 words
In a camera objective having rear lens means and front lens means spaced apart along an optical axis, the combination therewith of a blurring diaphragm with a mounting ring centered on said axis and interposed between said front and rear leans means, said blurring diaphragm having a circular array of iris leaves of light-scattering translucent material pivotally mounted on said ring and symmetrically movable toward said axis for defocusing an image projected by said front and rear leans means; an iris diaphragm with opaque leaves aligned with said blurring diaphragm and disposed between said front and rear lens means beyond said blurring diaphragm as seen in the direction of incident light; sensing means responsive to the light intensity between said diaphragms; and control means for said iris diaphragm responsive to said sensing means for opening said iris diaphragm upon closure of said blurring diaphragm.
Claim 3
Dependent Claim
135 words
In a camera objective having rear lens means and front lens means spaced apart along an optical axis, the combination therewith of a blurring diaphragm centered on said axis and interposed between said front and rear lens means, said blurring diaphragm having at least one pair of iris leaves of light-scattering translucent material symmetrically movable toward said axis for defocusing an image projected by said front and rear lens means; an iris diaphragm with opaque leaves aligned with said blurring diaphragm and disposed between said front and rear lens means beyond said blurring diaphragm as seen in the direction of incident light; sensing means responsive to the light intensity between said diaphragms; and control means for said iris diaphragm responsive to said sensing means for opening said iris diaphragm upon closure of said blurring diaphragm.
Claim 4
Dependent Claim
135 words
In a camera objective having rear lens means and front lens means spaced apart along an optical axis, the combination therewith of a blurring diaphragm centered on said axis and interposed between said front and rear lens means, said blurring diaphragm having at least one pair of iris leaves of light-scattering translucent material symmetrically movable toward said axis for defocusing an image projected by said front and rear lens means; an iris diaphragm with opaque leaves aligned with said blurring diaphragm and disposed between said front and rear lens means beyond said blurring diaphragm as seen in the direction of incident light; sensing means responsive to the light intensity between said diaphragms; and control means for said iris diaphragm responsive to said sensing means for opening said iris diaphragm upon closure of said blurring diaphragm.
Claim 5
Dependent Claim
13 words
The combination defined in claim 2 wherein said translucent material is synthetic-resin foil.
Claim 6
Dependent Claim
15 words
The combination defined in claim 2, further comprising an additional lens interposed between said diaphragms.
Claim 7
Dependent Claim
14 words
The combination defined in claim 4 wherein said additional lens has near-zero refractive power.
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) | 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 |