Abstract: Image setting apparatus is disclosed for producing two-dimensional images on photosensitive sheet material. The apparatus includes a device for transporting the photosensitive sheet material past an image point to provide a first dimension of the two-dimensional image; a light source for producing a modulated beam of light, a scanning device for converting the light beam into a scanning beam; and a scan lens in the path of the scanning beam such that a focused beam spot moves repeatedly in a linear direction across the photosensitive material at the image point to provide the other dimension of the two-dimensional image. According to one improvement the scanning device is a rotatable prism having two mirror facets whose planes intersect in a common line. The prism is arranged to rotate about an axis perpendicular to this line so as to reflect the light beam into a scanning beam having a substantially constant angular velocity.

Abstract: The present invention is concerned with an electrophotographic apparatus for producing high quality, toned, first generation images.

Abstract: A photocomposing machine and font strip therefor are described which allow type designers to have the flexibility to design typographical characters which are kerned. The photocomposing machine is able to automatically kern those characters which are designed to be kerned. The automatic kerning is accomplished by intentionally offsetting each character's placement on the font strip to the left with respect to the machine's aperture, and providing an optical system in the photocomposing machine which intentionally offsets the projection of the font strip through the aperture of the machine to the right, thereby cancelling the offset of unkerned characters. Kerned characters are placed to the right on the font strip in order to allow the machine's optical system offset to overlap the image of kerned characters on the space normally reserved for the next character.