Colour splitting prism assembly

Details Colour splitting prism assembly Colour splitting prism assembly

G - Physics

02

B

88/98

G02B 5/04 (2006.01) G02B 27/10 (2006.01) G02B 27/14 (2006.01)

Patent

CA 1069360

ABSTRACT OF THE DISCLOSURE This invention relates to a colour splitting prism assembly for colour television cameras which splits the incident light in such a camera into a plurality of beams of different spectral compositions intended for the pick-up tubes of the camera. The prism arrangement which ensures splitting is a combination of a plurality of prisms, for example three in number. The positioning of the prisms relative to one another must be done very accurately and furthermore some prisms must be separated from one another by means of a very narrow air gap. To maintain the air gap there is provided along the edges of a prism surface, at said air gap, a small strip of thermoplastic material for maintaining a gap. Optionally, the prism surface can first be coated with a beam splitting layer upon which the thermoplastic material is then fixed. This invention allows for a much more accurate spacing, with less distortion, than known prism assemblies which use wire to maintain the air gap.

262805

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