INEXPENSIVE AND RELIABLE CUSTOM PROGRAMMABLE PHOTOTYPESETTER

摘要

ABSTRACT OF THE DISCLOSUREA phototypesetter is disclosed having a stepping motor whichactuates an escapement carriage coupled to an elongated carriagedriving member. A projection lens carriage and a collimatinglens carriage are selectively electromagnetically coupled to theelongated driving member, thereby to project images of varyingcharacter sizes through a focusing lens coupled to the escapementcarriage, which sequentially projects focused character imagesacross a photosensitive film on a line by line basis. A trackselect mirror is also selectively electromagnetically coupled tothe elongated driving member for selectively projecting one ofa plurality o. tracks bearing characters of differing fontscarried by a rotatable font carrier element. A group of custom-ized lens carriage positioning control codes and customized sizingcodes, unique for each phototypesetter as a function of lensparameter variations. are stored within a size dictionary and aparticular set, associated with the character size being typesetis read out of the dictionary and is employed to control thecustomized positioning of the lens carriages and image (film)positioning stepping motors. A novel technique is also disclosedwhereby a customized group of the above-mentioned codes is rapidlyand easily generated by an iterative image inspection process foreach particular phototypesetter during manufacture.