Patent ID: 7079170
Filing Date: 2006-07-18
Classification: B41J

Abstract:
1. A method of correcting the light amount of a printhead in which plural light-emitting chips, in which plural light-emitting elements are formed in a row, are disposed in a row, the method comprising: determining beam profiles of the plural light-emitting elements including a joint of the light-emitting chips; slicing the beam profiles at a predetermined level and determining distance between the light-emitting elements at the joint of the light-emitting chips from distance between median points of the sliced plane; comparing the determined distance between the light-emitting elements with resolution pitch of the light-emitting printhead; raising light amount of the light-emitting elements of at least one side of the joint of the light-emitting chips when the determined distance between the light-emitting elements is longer than the resolution pitch; and lowering light amount of the light-emitting elements of at least one side of the joint of the light-emitting chips when the distance between the light-emitting chips is shorter than the resolution pitch.