US4436400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for positive vignetting
Assignee: Individual
•
Filing: 1981-12-03
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Granted: 1984-03-13
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Expires: 2001-12-03
Abstract
Abstract The apparatus of the present invention is for use with a subject and a camera, including a lens and a shutter, for positive vignetting comprising a means adjacent the camera lens for at least partially obstructing subject light received by the camera lens in regions of the camera lens to be positive vignetted, a means for providing auxiliary light to the region adjacent the camera lens, and a means for directing a pattern of the auxiliary light to the camera lens in the regions of the camera lens to be positive vignetted. The method of the present invention is for use with a subject and a camera including a lens for providing positive vignetting comprising the steps of partially obstructing subject light from the camera lens in a region of the camera lens to be positive vignetted, and, introducing auxiliary light to the region to be positive vignetted.
Inventors
- 👤 Phillip S. Charis
- 👤 Roy Sweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:07
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B11/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
229 words
A positive vignetting apparatus for positioning between a camera lens and a subject to be photographed to allow the addition of lighting to the peripheral region of a photographic image of the subject without interference with the central subject region thereof comprising: a housing for positioning between the lens of a camera and the subject to be photographed; said housing including a direct optical path therethrough between the subject and the lens of the camera with which the apparatus is associated, said optical path being free of optical elements in the region of the optical path directed at the subject; vignetting means for partially obstructing a portion of the direct optical path between the subject and the lens of said camera; an auxiliary light source contained within said housing and positioned between said vignetting means and the lens of said camera; means shielding the lens of the camera from direct exposure to said auxiliary light source; said auxiliary light source being operative to illuminate the face of said vignetting means on the side thereof exposed to the lens of said camera; whereby said lens is illuminated directly by light from said subject without intervening optical elements in a portion of the optical path between the subject and the camera lens is illuminated indirectly at peripheral regions of the optical path to provide positive vignetting of the peripheral regions thereof.
Claim 2
Dependent Claim
229 words
A positive vignetting apparatus for positioning between a camera lens and a subject to be photographed to allow the addition of lighting to the peripheral region of a photographic image of the subject without interference with the central subject region thereof comprising: a housing for positioning between the lens of a camera and the subject to be photographed; said housing including a direct optical path therethrough between the subject and the lens of the camera with which the apparatus is associated, said optical path being free of optical elements in the region of the optical path directed at the subject; vignetting means for partially obstructing a portion of the direct optical path between the subject and the lens of said camera; an auxiliary light source contained within said housing and positioned between said vignetting means and the lens of said camera; means shielding the lens of the camera from direct exposure to said auxiliary light source; said auxiliary light source being operative to illuminate the face of said vignetting means on the side thereof exposed to the lens of said camera; whereby said lens is illuminated directly by light from said subject without intervening optical elements in a portion of the optical path between the subject and the camera lens is illuminated indirectly at peripheral regions of the optical path to provide positive vignetting of the peripheral regions thereof.
Claim 3
Dependent Claim
46 words
The combination in accordance with claim 1 wherein said auxiliary light source comprises a strobe lamp and triggering means therefore responsive to increased ambient light in the region of the camera to energize said strobe light synchronized with the increase in ambient light on the subject.
Claim 4
Dependent Claim
52 words
The combination in accordance with claim 1 including selectable filters within said housing in the light path from said auxiliary light source to the camera lens whereby the color of the auxiliary light may be changed without affecting the color properties of the direct path between the subject and the camera lens.
Claim 5
Dependent Claim
40 words
The combination in accordance with claim 3 wherein said selectable filters are mounted on a color filter wheel which is rotatable by the operator to place different filters in the auxiliary light path to provide different colors of positive vignetting.
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |