Patent ID: 7586507

Claim:
An apparatus for forming a latent pixel pattern onto a moving photosensitive recording medium comprising: (a) a plurality of exposure sources arranged in an array for generating exposure pulses for writing pixels onto the medium; (b) transport mechanism for moving the medium past the plurality of exposure sources during exposure; (c) a speed sensing system responsive to the transport mechanism for providing a positional signal related to the speed of the moving medium past the plurality of exposure sources, the positional signal indicating successive pixel write locations along the medium; and (d) drive pulse control logic circuitry responsive to the positional signal and to the pixel pattern for driving each exposure source in the plurality of exposure sources to generate at least a first exposure pulse and a second exposure pulse for each pixel location at which a pixel is to be written, wherein the first exposure pulse begins at a first predetermined time relative to the positional signal and the second exposure pulse ends at a second predetermined time separated from the first predetermined time, and wherein a grayscale value of the pixel is controlled by a pulse width of the first exposure pulse and a pulse width of the second exposure pulse and wherein, each pixel written onto the moving medium has substantially the same elongated dimension in the direction of media movement.