Abstract: Optical scanning apparatus comprising a source of light, a rotatable reflecting element having a plurality of reflective facets which are inclined to the axis of rotation, a beam expander for deriving a collimated beam of light from the source, this collimated beam being directed at the reflecting element in a direction parallel to its axis of rotation to impinge upon successive facets thereof as it is rotated. The apparatus also includes a support, which may be a system of rollers, for defining a position for a recording element having a surface that requires scanning, a projection lens for focussing the collimated beam as reflected by the reflecting element onto the surface of the recording element, a motor coupled to rotate the reflecting element, so that each facet in turn causes the focussed beam to scan across the surface in one direction, and a drive for moving the recording element substantially perpendicular to the direction of scanning, past said focussed beam.

Abstract: Photocomposing apparatus comprising a projection system for projecting optical images selected from a character matrix onto a photosensitive recording member by way of a mirror which is rotatable to displace projected images with respect to the recording member. The projection system includes a wide-angle lens for focussing the optical images onto a substantially flat image plane coincident with the recording member, and a zoom lens system arranged to produce a first fixed image which provides, by the action of the rotatable mirror, an object for the wide-angle lens which is selectively positionable in a substantially flat object plane.