Electrophotographic copier having movable optical elements for changing the magnification of an original document

Claim 1

An electrophotographic copier for forming a copy of a document comprising means for moving a document to be copied through an exposing position; means arranged at the exposing position for illuminating the moving document; a life-size image projecting optical system having a converging optical fiber array which forms a life-size image of the illuminated document and being arranged movably between first and second positions with respect to an optical axis; a modified-size image projecting optical system for forming a modified-size image of the illuminated document and having a plurality of optical elements at least one of which is secured to said converging optical fiber array, remaining optical elements being arranged fixedly; means for moving said converging optical fiber array together with said at least one optical element of the modified-size image projecting optical system; a photosensitive member arranged movably in synchronism with the movement of the document for receiving either one of said life-size image and modified-size image of the document to form a corresponding electrostatic latent image; and means for forming a duplicated copy with the aid of the latent image; whereby when said converging optical fiber array is in said first position, said life-size image is projected onto said photosensitive member, and when said converging optical fiber array is in said second position, said at least one optical element is in the optical axis to project the modified-size image of the document onto the photosensitive member.