Movie light, low voltage incandescent lamp unit for use therewith, and reflector
AssigneeGTE Sylvania Incorporated
InventorsGeorge J. English, Robert E. Levin
Life of this patent
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Abstract
A movie light including a plastic holder, a pair of spaced-apart incandescent lamp units positioned within the holder, and means for electrically connecting the lamp units to an external power source. Each lamp unit comprises a formed glass reflector which has an internal reflective surface containing three separate diffusing regions, the most diffusing of which is oriented nearest and about the reflector's optical axis. Each unit also includes a low voltage tungsten-halogen lamp located within the reflector and having a planar single filament therein. An incandescent lamp unit suitable for use in the movie light and a reflector for use therewith are also disclosed.
Claims26
A reflector for providing controlled diffusion of light, said reflector including a concave, internal diffusing surface having first, second, and third individual diffusing regions, each located about the optical axis of said reflector, said first region being positioned nearer said optical axis than said second and third regions, said second region being less diffuse than said first region and positioned contiguous thereto, and said third region being less diffuse than said second region and positioned contiguous thereto.
A lamp unit for providing a controlled, diffuse beam of light, said unit comprising:
- a reflector including a concave, internal diffusing surface having first, second, and third individual diffusing regions, each located about the optical axis of said reflector, said first region being positioned nearer said optical axis than said second and third regions, said second region being less diffuse than said first region and positioned contiguous thereto, said third region being less diffuse than said second region and positioned contiguous thereto;
- and
- a low-voltage incandescent lamp positioned within said reflector, said lamp including a light-transmitting envelope substantially surrounded by said concave, internal diffusing surface of said reflector and a substantially planar, single filament supported within said envelope.
A movie light comprising:
- a holder adapted for being mounted on a movie camera;
- first and second spaced-apart lamp units positioned within said holder, each of said lamp units having a reflector including a concave, internal diffusing surface having first, second, and third individual diffusing regions, each located about the optical axis of said reflector, said first region being positioned nearer said optical axis than said second and third regions, said second region being less diffuse than said first region and positioned contiguous thereto, said third region being less diffuse than said second region and positioned contiguous thereto, and a low voltage incandescent lamp positioned within said reflector, said lamp including a light-transmitting envelope substantially surrounded by said concave, internal diffusing surface of said reflector and a substantially planar, single filament supported within said envelope, the plane of said filament of said first lamp unit intersecting the plane of said filament of said second lamp unit at a predetermined angle;
- and
- means for electrically connecting said first and second lamp units to an external power source.
Dependencies are inferred from the claim text.