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Light chopper assembly

  • US 4,909,600 A
  • Filed: 10/28/1988
  • Issued: 03/20/1990
  • Est. Priority Date: 10/28/1988
  • Status: Expired due to Term
First Claim
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1. A light chopper assembly that includesa wheel that is arranged to pass through a fixed light beam and which is formed by joining a pair of similarly shaped thin metal plates in back-to-back contact,said wheel having a series of filter windows circumferentially spaced about a first diameter on the wheel and a second series of clear windows circumferentially spaced about a second diameter on the wheel,a color filter means mounted between the plates behind each filter window,each color filter means being transparent to said light beam to permit light to pass therethrough, andeach filter window being positioned adjacent to a clear window so that two opposed side walls of the adjacent windows lie along a common radius of said wheel whereby each window is capable of passing through the light beam in the same period of time.

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