Abstract: A dot matrix converter comprising means for providing an original character pattern comprising a dot matrix; means for dividing the original matrix into row groups and column groups, the number of groups being respectively one greater than the row difference and the column difference between the original matrix size and a desired matrix size to which the original matrix is to be converted; row (or column) size converting means which compare the individual opposed bits in the rows (or columns) on the opposite sides of dividing lines between adjacent row (or column) groups and inserts a logical "1" bit between the compared bits when both bits are logical "1" or inserts a logical "0" bit in all other cases, thereby effecting the addition of one row (or column) between the divided adjacent row (or column) groups; and column (or row) size converting means which compare the individual opposed bits in the columns (or rows) on the opposite sides of the dividing lines between adjacent column (or row) groups, and inser

Abstract: An optical printer comprises a mechanical scanner, which scans a modulated light beam across a recording medium in a main or horizontal direction at a fixed speed. An acousto-optic deflector performs auxiliary scanning of the beam in a vertical direction onto the mechanical scanner at a constant rate and is connected to a deflection signal generator. The deflection signal generator adjusts the stroke length of auxiliary scan in accordance with the magnification ratio and simultaneously adjusts the frequency of auxiliary scanning by the reciprocal of the magnification rate of the character to be printed. Furthermore, optical density is maintained constant for various character sizes by providing auxiliary gate pulses proportional to the square of the relative character size, which are AND gated with a character information signal to effect a light modulation signal for modulating the beam.