Patent ID: 6151099
Filing Date: 2000-11-21
Classification: G03F,H04N

Abstract:
An apparatus for exposing a printing plate wound around a drum to spirally record image information therein in the form of band strips, with a plurality of image elements record in a band width, in a multi-beam system for simultaneously recording image date of one band width, said apparatus comprising:a printing plate wound around a drum in the form of a right circular cylinder,an exposing means comprising a vibration mirror to record image information in the form of a band strip on said printing plate by means of a light beam,a moving mechanism to move said exposing means comprising a vibration mirror in relation to said drum in the direction of the drum axis by a distance of one band width per revolution of the drum, anda circuit to generate an incline distortion offsetting signal in a sawtooth wave pattern having the same cycle a that of the rotation of the drum with the initial position of recording on the band as starting point,wherein said incline distortion offsetting signal is applied to the exposing means comprising a vibration mirror to deflect the light beam in sequence in the opposite direction to the moving direction of said moving mechanism until the light beam is distorted by one band width per revolution of the drum, thereby recording an undistorted complete printing image.