Stage lighting apparatus
First Claim
1. Stage lighting apparatus, including a beam former comprising a lamp that emits a spectrum of visible and infra-red light, a reflector about said lamp for projecting light from the lamp as a beam, and beam modifying devices for imparting desired characteristics to the beam including devices that are vulnerable to damage by the infra-red content of a beam of light from the lamp, and infra-red filtering means including an infra-red filter disposed across the beam between the reflector and the beam modifying devices, said infra-red filter comprising a chamber having light-transmitting walls, a surface of the chamber facing the reflector bearing a dichroic layer that selectively passes visible light and reflects infra-red, said chamber being filled with liquid having the characteristics of selectively passing visible light and absorbing infra-red from the beam.
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Accused Products
Abstract
The disclosed stage lighting apparatus includes a constant-direction beam forming unit and an adjustable beam redirector for aiming the beam at a wide range of locations varying in azimuth and elevation, and programmable remote-control equipment for the various adjustments of the beam-forming unit and the beam redirector. The beam-forming unit comprises a lamp and a heat-absorbing ellipsoidal reflector acting with the lamp to provide a beam; a heat-extracting filter in the path of the beam comprising a chamber containing circulated liquid that absorbs infra-red and a dichroic filter that reflects infra-red and is cooled by the circulated liquid of the chamber; an adjustable filter in the path of the beam comprising three elongated mutually overlapping subtractive color filters and a neutral brightness control filter, each filter having densities varying from clear to a maximum; an adjustable beam shaper; and adjustable beam-focussing lenses, all of which provides a constant-direction beam, the beam then being adjustably directed to the stage.
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Citations
14 Claims
- 1. Stage lighting apparatus, including a beam former comprising a lamp that emits a spectrum of visible and infra-red light, a reflector about said lamp for projecting light from the lamp as a beam, and beam modifying devices for imparting desired characteristics to the beam including devices that are vulnerable to damage by the infra-red content of a beam of light from the lamp, and infra-red filtering means including an infra-red filter disposed across the beam between the reflector and the beam modifying devices, said infra-red filter comprising a chamber having light-transmitting walls, a surface of the chamber facing the reflector bearing a dichroic layer that selectively passes visible light and reflects infra-red, said chamber being filled with liquid having the characteristics of selectively passing visible light and absorbing infra-red from the beam.
- 5. A stage lighting unit including a beam former that includes means for forming a beam and means for imparting desired characteristics to the beam, the last-named means including three elongated color filter elements with areas overlapping each other and intercepting the beam, said color filter elements having subtractive colors whose density varies along each element from clear to a maximum, any two of said color filters, when overlapped, having subtractive colors which pass a color different from that which is passed by each other combination of two of the three color filter elements and means for adjusting each of said elongated filter elements relative to the beam so that a selected area along the length of each of said filter elements intercepts the beam.
- 10. A stage lighting unit including a beam former that includes means for forming a beam and means for imparting desired characteristics to the beam, the last-named means including three elongated color filter elements with areas overlapping each other and intercepting the beam, said color filter elements having subtractive colors whose density varies along each element from clear to a maximum, any two of said color filters, when overlapped, having subtractive colors which pass a color different from that which is passed by each other combination of two of the three color filter elements, and an elongated neutral filter element whose density varies along its length for controlling the beam'"'"'s brightness and means for adjusting each of said elongated filter elements relative to the beam so that a selected area along the length of each of said filter elements intercepts the beam.
Specification