Improvements in optical system for moving picture projectors

  • Inventors:
  • Assignees: Arthur John Holman
  • Publication Date: January 12, 1928
  • Publication Number: GB-283358-A

Abstract

283,358. Holman, A. J. Feb. 14, 1927. Kinematograph apparatus. - In continuous-feed projectors utilizing a single light beam and having a system of rotating lenses for optical compensation, one or both of the lenses B, C of the main condenser has a surface of greater power on one axis than on the other so as to produce an elliptical area of illumination at the gate 4 - - 4. After passing the condenser the light passes through a plano-convex lens D and then through a cylindrical lens E immediately before the gate. This latter lens has its axis parallel to the minor axis of the elliptical area of light whereby the beam a is caused to become circular in crosssection before reaching the optical compensating lenses G, G<1>. To correct for chromatism a concave lens F is situated as shown in the path of the rays and is of different glass to that of the optical compensator lenses G, G<1>. After passing the diaphragm J the beam is projected on to the screen by an objective H.

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