US4729065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photography light
Assignee: Arriflex Corp
•
Filing: 1987-04-24
•
Granted: 1988-03-01
•
Expires: 2007-04-24
Abstract
Abstract A photography light for providing fill illumination includes a first reflector having planar sides and an opening in a rear portion thereof, a second reflector lying within the first reflector and overlying the opening therein. The second reflector forming light compensating channels with the sides of the first reflector and includes at least one aperture in a rear surface thereof through which lamps may be variably positioned. The light compensating channels allow a portion of the light blocked by the backs of the reflectors when the lamps are in a retracted position, to pass to the front portion of the reflectors to be reflected into the photographing field thereby smoothing the illumination therein.
Inventors
- 👤 Volker W. Bahnemann
- 👤 Stanislaw Loth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:50
CPC Classifications
F; F21; F21V; F21V19/00; F21V19/02; F21W; F21W2131/00; F21W2131/40; F21W2131/406
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
A photography light comprising: (a) a main reflector having an upper surface, a lower surface, and two side surfaces, said surfaces being made reflective on an inner portion of said main reflector, said main reflector also being formed with an opening in a rear portion thereof; (b) a secondary reflector also having an upper surface, a lower surface, and two side surfaces, said secondary reflector further having a rear surface having aperture means formed therein, said surfaces being made reflective on an inner portion of said secondary reflector, said secondary reflector being positioned within and spaced from said opening in said main reflector such that said aperture means in said secondary reflector overlies said opening and the surfaces of said secondary reflector form light compensating channels with the respective surfaces of said main reflector; (c) illuminating means positionable within said aperture means for illuminating a photographing field, said illuminating means being elongated along an axis of said aperture means; and (d) means for positioning said illuminating means along said axis of said aperture means in a first position, in which said illuminating means is fully inserted in said aperture means and all the illumination therefrom is available for illuminating said photographing field, and in a second position, in which said illuminating means is fully retracted from said aperture means and only a portion of the illumination therefrom passes through said aperture means and said light compensating channels, a remaining portion of said illumination being blocked by a back surface of said main and secondary reflectors.
Claim 2
Dependent Claim
255 words
A photography light comprising: (a) a main reflector having an upper surface, a lower surface, and two side surfaces, said surfaces being made reflective on an inner portion of said main reflector, said main reflector also being formed with an opening in a rear portion thereof; (b) a secondary reflector also having an upper surface, a lower surface, and two side surfaces, said secondary reflector further having a rear surface having aperture means formed therein, said surfaces being made reflective on an inner portion of said secondary reflector, said secondary reflector being positioned within and spaced from said opening in said main reflector such that said aperture means in said secondary reflector overlies said opening and the surfaces of said secondary reflector form light compensating channels with the respective surfaces of said main reflector; (c) illuminating means positionable within said aperture means for illuminating a photographing field, said illuminating means being elongated along an axis of said aperture means; and (d) means for positioning said illuminating means along said axis of said aperture means in a first position, in which said illuminating means is fully inserted in said aperture means and all the illumination therefrom is available for illuminating said photographing field, and in a second position, in which said illuminating means is fully retracted from said aperture means and only a portion of the illumination therefrom passes through said aperture means and said light compensating channels, a remaining portion of said illumination being blocked by a back surface of said main and secondary reflectors.
Claim 3
Dependent Claim
63 words
A photography light as claimed in claim 1, wherein said positioning means also positions said illuminating means in variable intermediate positions of said illuminating means between said first position and said second position, varying portions of the illumination radiated from said illuminating means passing through said aperture means and said light compensating channels as said illuminating means is positioned in said intermediate positions.
Claim 4
Dependent Claim
17 words
A photography light as claimed in claim 1, wherein said surfaces of said main reflector are planar.
Claim 5
Dependent Claim
17 words
A photography light as claimed in claim 3, wherein said surfaces of said secondary reflector are planar.
Claim 6
Dependent Claim
25 words
A photography light as claimed in claim 1, wherein said illuminating means comprises a plurality of lamps elongated along the axis of said aperture means.
Claim 7
Dependent Claim
16 words
A photography light as claimed in claim 5, wherein said plurality of lamps are three lamps.
Claim 8
Dependent Claim
19 words
A photography light as claimed in claim 5, wherein said plurality of lamps are of a long filament type.
Claim 9
Dependent Claim
17 words
A photography light as claimed in claim 5, wherein said plurality of lamps are gas discharge type.
Claim 10
Dependent Claim
86 words
A photography light as claimed in claim 2, wherein said positioning means includes: (1) a fixture to which said illuminating means is mounted; (2) a rack mounted to a bottom surface of said fixture along the axis of said aperture means; (3) a pinion for engaging said rack; and (4) a calibrated knob for rotating said pinion, whereby when said knob is rotated, said pinion also rotates causing said rack to variably position said fixture and said illuminating means along the axis of said aperture means.
Claim 11
Dependent Claim
30 words
A photography light as claimed in claim 1, wherein the surfaces of the secondary reflector are reflective on the back portion of the secondary reflector at said light compensating channels.
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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |