Importance

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Abstract

An electrophotographic typesetting system having a raster scanning means including means for directing a beam of modulated radiation across an imaging surface, means for providing relative motion between said beam and an imaging surface to produce a succession of raster lines, and forming a plurality of characters on said surface, including means for providing first digital data defining the identity and location of characters, font storage means providing data defining the contour of a plurality of characters with respect to a normalized encoded set of first and second coordinates, data processing means connected to said first and second digital data for producing third digital data defining the character boundaries intersecting a raster line, means for modulating said beam to change the state of the beam from a first state to a second state at a first intersection and to reverse the state of the beam at a successive intersection, forming said characters on said surface, said data processing means including a raster line store for storing said third digital data, and a controller for controlling at least a part of said system and having means for interogating said raster line store and inhibiting said data processing means from transmitting said third digital data in response to an incompletely filled line store.

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First Claim