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Lighting device with all parameters adjustable simultaneously, in particular for use as a stage light

  • US 4,745,531 A
  • Filed: 05/29/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 05/31/1985
  • Status: Expired due to Fees
First Claim
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1. A lighting device comprising a wide light source adapted to produce a light beam, said light source having electrodes with an effective length greater than 6 mm, a reflective mirror disposed behind said light source, and in front of said light source, along the path of the light beam and spaced in succession from said light source toward an outlet end of the lighting device, an adjustable iris diaphragm, at least two optical lenses mounted for displacement along the path of the light beam relative to each other and arranged such that the image of the light source is focused on a forwardmost one of said two optical lenses, and a plurality of colored filters disposed in spaced relationship, each of said plurality of colored filters comprising a pair of films of colored transparent material mounted for movement into and out of the path of the light beam whereby the light beam exiting the lighting device defines a spot of homogeneous color and intensity which is gradually changeable in color by displacement of selective pairs of films of transparent material into and out of the path of the light beam.

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