US4200902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photography light
Assignee: Individual
•
Filing: 1978-11-16
•
Granted: 1980-04-29
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Expires: 1998-11-16
Abstract
Abstract A camera-mounted illuminating device particularly useful for motion picture photography to provide relatively constant lighting of close-up scenes in motion pictures despite movement of the camera toward and away from the scene.
Inventors
- 👤 Charles Intrator
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:33
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
176 words
An illuminating device comprising a housing; a high temperature lamp, suitable for color photography, mounted at the forward part of the housing; a reflector, forward of the lamp, to reflect its light toward the back of the housing; a plurality of sets of strips of different light reflectivity at the rear of the housing and situated to receive the light from the reflector; one set of said strips having a reflective diffusive white exposed outer surfaces for reflecting light towards said forward part of the housing and the other set having a non-reflective dull black exposed outer surface, the leaves of one set being positioned between, and alternating with, the strips of the other set; the sets being mounted for relative sliding movement so that the strips of one set progressively cover and obscure those of the other set and thus progressively vary the amount of light reflected forward by the device; and means for effecting said sliding movement, said device being constructed to illuminate by the light emanating from the forward part of the housing.
Claim 2
Dependent Claim
176 words
An illuminating device comprising a housing; a high temperature lamp, suitable for color photography, mounted at the forward part of the housing; a reflector, forward of the lamp, to reflect its light toward the back of the housing; a plurality of sets of strips of different light reflectivity at the rear of the housing and situated to receive the light from the reflector; one set of said strips having a reflective diffusive white exposed outer surfaces for reflecting light towards said forward part of the housing and the other set having a non-reflective dull black exposed outer surface, the leaves of one set being positioned between, and alternating with, the strips of the other set; the sets being mounted for relative sliding movement so that the strips of one set progressively cover and obscure those of the other set and thus progressively vary the amount of light reflected forward by the device; and means for effecting said sliding movement, said device being constructed to illuminate by the light emanating from the forward part of the housing.
Claim 3
Dependent Claim
24 words
A device as in claim 1 including means for attaching said device to an operating movable motion picture camera for movement with said camera.
Claim 4
Dependent Claim
19 words
A device as in claim 1 mounted on an operating movable motion picture camera for movement with said camera.
Claim 5
Dependent Claim
130 words
An illuminating device comprising a housing having a forward opening and a back portion of variable reflectivity; a high temperature lamp suitable for color photography mounted at the forward part of the housing, said lamp having a filament in a bulb whose diameter is less than 3 cm; a reflector forward of the lamp, to reflect its light toward said back portion, said reflector having a first portion situated less than 5 mm from said bulb and comprising highly reflective sheet aluminum; means for supporting said reflector comprising a spring-loaded clamp engaging a portion of said reflector at a point remote from said first portion and fixed means for engaging said reflector between said remote point and said first point; and means for varying the reflectivity of said back portion.
Claim 6
Dependent Claim
130 words
An illuminating device comprising a housing having a forward opening and a back portion of variable reflectivity; a high temperature lamp suitable for color photography mounted at the forward part of the housing, said lamp having a filament in a bulb whose diameter is less than 3 cm; a reflector forward of the lamp, to reflect its light toward said back portion, said reflector having a first portion situated less than 5 mm from said bulb and comprising highly reflective sheet aluminum; means for supporting said reflector comprising a spring-loaded clamp engaging a portion of said reflector at a point remote from said first portion and fixed means for engaging said reflector between said remote point and said first point; and means for varying the reflectivity of said back portion.
Claim 7
Dependent Claim
19 words
A device as in claim 4 mounted on an operating movable motion picture camera for movement with said camera.
Claim 8
Dependent Claim
99 words
An illuminating device comprising a housing having a rectangular foward opening and substantially flat top, bottom and side walls, the inside faces of said walls being dull, non-reflective black; a high temperature lamp, suitable for color photography, mounted at the forward part of the housing; a reflector, forward of the lamp, to reflect its light toward the back of the housing; the rear of said housing having a plurality of strips having diffusive white reflective faces situated to receive substantially all the light reflected rearwardly by said reflector and means for progressively obscuring said white faces from said light.
Claim 9
Dependent Claim
99 words
An illuminating device comprising a housing having a rectangular foward opening and substantially flat top, bottom and side walls, the inside faces of said walls being dull, non-reflective black; a high temperature lamp, suitable for color photography, mounted at the forward part of the housing; a reflector, forward of the lamp, to reflect its light toward the back of the housing; the rear of said housing having a plurality of strips having diffusive white reflective faces situated to receive substantially all the light reflected rearwardly by said reflector and means for progressively obscuring said white faces from said light.
Claim 10
Dependent Claim
19 words
A device as in claim 6 mounted on an operating movable motion picture camera for movement with said camera.
Claim 11
Dependent Claim
50 words
A device as in claim 6 in which said strips are flat slats pivotally mounted for rotation from said light receiving position to a position in which their white faces are substantially parallel to the front-to-rear axis of the housing or are turned away from the light from said lamp.
Claim 12
Dependent Claim
54 words
A device as in claim 6 in which said strips comprise a substantially fixed set of leaves and a movable set of leaves mounted for substantially linear movement progressively from positions obscured from the light of said lamp by the leaves of said fixed set to positions obscuring the leaves of said fixed set.
Claim 13
Dependent Claim
94 words
A device as in claim 9 said lamp being mounted centrally at the forward part of the housing, said lamp having a filament in a bulb whose diameter is less than 3 cm, said reflector having a first portion situated less than 5 mm from said bulb and comprising highly reflective sheet aluminum; said device including means for supporting said reflector comprising a spring-loaded clamp engaging a portion of said reflector at a point remote from said first portion and fixed means for engaging said reflector between said remote point and said first point.
Claim 14
Dependent Claim
81 words
A device as in claim 8, the construction and arrangement being such that there are a plurality of sets of said slats mounted so that when the slats are in a position giving high light reflection the slats of one set are at an angle to the slats of a second set, and said obscuring means comprises means for rotating the slats of said one set in one direction for rotating the slats of said second set in the opposite direction.
Claim 15
Dependent Claim
61 words
A device as in claim 11 wherein the slats of one set are at about 45 degrees to the slats of the second set when the slats are in said high reflection position and the slats of said two sets are substantially parallel to each other, and to said axis, when the slats are in a position giving low light reflection.
Claim 16
Dependent Claim
81 words
A device as in claim 4 in which said reflector has an end adjacent to said remote point and an opposite end adjacent to said first portion, said opposite end being free, the construction of said reflector being such that when clamped its first portion tends to approach said bulb and the extent of such approach is limited by said stop means, said reflector being resilient, so that when clamped at said remote point the reflector presses resiliently against said stop.
Claim 17
Dependent Claim
105 words
An illuminating device comprising a housing having a forward opening and back portion of variable reflectivity; a high temperature lamp suitable for color photography mounted at the forward part of the housing, said lamp having a filament in a bulb whose diameter is less than 3 cm; a reflector forward of the lamp, to reflect its light toward said back portion, said reflector having a first portion situated less than 5 mm from said bulb and comprising highly reflective sheet aluminum dished at said first portion to conform to the adjacent part of said bulb, and means for varying the reflectivity of said back portion.
Claim 18
Dependent Claim
105 words
An illuminating device comprising a housing having a forward opening and back portion of variable reflectivity; a high temperature lamp suitable for color photography mounted at the forward part of the housing, said lamp having a filament in a bulb whose diameter is less than 3 cm; a reflector forward of the lamp, to reflect its light toward said back portion, said reflector having a first portion situated less than 5 mm from said bulb and comprising highly reflective sheet aluminum dished at said first portion to conform to the adjacent part of said bulb, and means for varying the reflectivity of said back portion.
Claim 19
Dependent Claim
52 words
A device as in claim 14 in which said reflector has a central reflective portion in which said first portion is situated, and substantially flat reflective wings extending substantially symmetrically at an angle to said first portion in directions to receive the light from said lamp and reflect it toward said back.
Claim 20
Dependent Claim
20 words
A device as in claim 15 in which said central reflective portion and said wings are of specular aluminum sheet.
Claim 21
Dependent Claim
94 words
A device as in claim 16 in which said angle is about 60 to 75 degrees, the lengths of said wings are insufficient to substantially block the light reflected forwardly from said back portion, said device comprising a housing having a rectangular forward opening, and substantially flat top, bottom, and side walls, the inside faces of said walls being dull, non-reflective black, said rectangular opening having an area of about 200 to 600 cm/sq., and the distance from said forward opening to said back portion of variable reflectivity being about 10 to 20 cm.
Claim 22
Dependent Claim
80 words
A device as in claim 17 in which said area is about 300 to 400 cm/sq., said distance is about 10 to 16 cm. The rating of said lamp is about 600 watts, and its color temperature is about 3200 degrees Kelvin, the rear of said housing having a plurality of strips having diffusive white reflective faces situated to receive substantially all the light reflected rearwardly by said reflector and means for progressively obscuring said white faces from said light.
Claim 23
Dependent Claim
22 words
A device as in claim 13 in which said stop means comprises a resilient clip frictionally engaging the base of said lamp.
References Cited (Backward Citations)
US4052607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |