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Abstract

An exposure device for a color copying apparatus having a filter holding frame mounting a filter plate provided with color filter layers and a transparent section and a pair of aperture plates for forming a variable aperture. The filter holding frame is movable in a first direction perpendicular to an exposure light path to selectively place the filter layer and transparent section into the exposure light path. The aperture plates are movable toward and away from each other in a direction perpendicular to the first direction and to the exposure light path so as to vary the size of aperture formed therebetween. Between the filter holding frame and the pair of aperture plates there is a mechanism comprising pins and cam grooves for relative movement of the filter holding frame and the aperture plates. The cam groove comprises a straight cam section which extends along the moving direction and which is provided to place the pair of aperture blades out of the optical path so as to maintain the maximum size of the variable aperture and an inclined cam section which is provided to bring the pair of the aperture blades into the optical path so as to vary the size of the variable aperture.

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First Claim