| 摘要 |
A head drive mechanism capable of improving color shading in an exposed image due to a variation or non uniformity in speed of a photosensitive head corresponding to pitches of teeth of a toothed belt (8). The photosensitive head (14) includes a dot block (14a), which is constituted by a luminous dot group constituted by a line of a row A formed of even luminous dots and a line of row B formed of odd luminous dots. Also, the rows A and B are so arranged that the luminous dots of the row A and those of the row B are offset from each other with an interval Ds being defined there between. A final transmission system is constituted of a toothed drive pulley (7), a toothed driven pulley (9) and a toothed belt (8). The toothed belt (8) is constructed so as to have tooth pitches Q = 2Ds/(2n+1) reduced in terms of a relative travel distance of the head, wherein n is O or a positive integer. <IMAGE> |
