Phototypesetters

Abstract

Abstract A phototypesetting machine employs a continuously rotating character font disc having a plurality of font circles with the character transparencies arranged such that similar characters have a common base line parallel to a radius of the disc. A high speed flash lamp giving a linear light source, is provided with a diffuser to form an essentially rectangular illuminating beam of light that is uniform across the character field. The light source and diffuser are mounted on one side of the disc and a collimating lens member along with a reflector are mounted on the opposite side of the disc all on the same carriage, to align the light source, lens and reflector with a selected font circle. A pair of spaced bars defining a reference plane and a main light transmission path extend parallel to the plane of the disc, and provide a mount for the input carriage. A second or output carriage also is movable along the bars, spaced to one side of the input carriage, and supporting a further lens and reflector which transmits the shaped light back from the main path to a recording plane, also parallel to the reference plane, at which photosensitive material is supported. A stepping motor moves the output carriage according to character widths, to form a successive lines of text on the photosensitive material.

Inventors

• 👤 H Purdy
• 👤 Intosh R Mc

Bibliographic Details